ASTM B673 UNS N08904 (904L) Cov Yeeb Nkab Hlau Stainless Welded: Kev Muaj Peev Xwm Tsim Khoom & Cov Lus Qhia Txog Khoom

Kev Piav Qhia Luv:

Womic Steel muab ASTM B673 UNS N08904 (904L) welded stainless hlau yeeb nkab rau cov chaw muaj zog corrosive heev suav nrog sulfuric acid, phosphoric acid, thiab dej hiav txwv chloride siab. 904L yog super austenitic stainless hlau nrog nickel siab (23-28%), chromium siab (19-23%), thiab molybdenum (4-5%), ntxiv rau tooj liab (1-2%) rau kev tiv thaiv zoo rau kev txo cov kua qaub. Yam tsawg kawg nkaus yield zog 220 MPa (31,900 psi), tensile zog 490 MPa (71,100 psi). Cov hlau no muaj pitting tsis kam sib npaug (PREN) ntawm 35-40, siab dua 316L, thiab zoo heev tiv thaiv kev ntxhov siab corrosion cracking. Kev tsim khoom suav nrog ERW rau cov kab me me thiab EFW rau cov kab loj, ob qho tib si nrog kev nkag mus tag nrho thiab tom qab-weld kua annealing. Sab nraud txoj kab uas hla ntawm 6.35mm txog 1219mm (1/4″ - 48″), phab ntsa tuab 0.5mm - 40mm, tus qauv ntev txog li 12m, kev cai txog li 18m. Daim ntawv pov thawj zeb, hydrotest, 100% UT, cov tshuaj annealed thiab pickled tiav, beveled lossis tiaj tus kawg muaj. Haum rau cov nroj tsuag sulfuric acid, phosphoric acid ntau lawm, flue gas desulfurization (FGD), seawater txias systems (kub siab), tshuaj tankers, offshore platforms (sour service), thiab cov khoom siv tshuaj.

Qhov Loj ntawm Cov Yeeb Nkab Hlau Stainless Welded:Sab Nraud Txoj Kab uas hla: 6.35mm – 1,219mm (1/4″ – 48″), Phab Ntsa Thickness: 0.5mm – 40mm (Teem sijhawm 5S, 10S, 40S), Ntev: 6m – 12m tus qauv, kev cai ntev txog li 18m

Tus Qauv & Qib ntawm Cov Yeeb Nkab Hlau Stainless Welded:ASTM B673 (cov yeeb nkab vuam) / ASTM B674 (seamless) / ASTM B677 (cov yeeb nkab seamless); UNS N08904; EN 10217-7 1.4539; Sib npaug rau 904L

Kev Siv Cov Yeeb Nkab Hlau Stainless Welded:Cov chaw tsim cov kua qaub sulfuric (cov kev pabcuam kua qaub uas muaj concentrated thiab dilute, cov tshuab ua kom txias kua qaub), kev tsim cov kua qaub phosphoric (cov tshuab ua kom cov dej ntub, cov kab hloov pauv), cov pa roj flue desulfurization (FGD) cov kav dej nqus thiab cov kab sib dhos, cov tshuab txias dej hiav txwv uas muaj qhov kub siab (30-50 ° C), cov nkoj thauj tshuaj thiab cov kav dej thauj khoom (cov tshuaj lom neeg), roj thiab roj av hauv hiav txwv (kev pabcuam qaub nrog H₂S thiab chlorides siab), cov chaw tsim cov tshuaj dawb pulp thiab ntawv (chaw muaj chloride siab), cov khoom siv tshuaj, cov khoom siv zas xim textile, kev ua zaub mov (cov kua qaub chloride siab), cov khoom hloov pauv cua sov rau cov dej txias siab.

Womic Steel muab cov khoom zoo thiab cov nqi sib tw ntawm ASTM B673 UNS N08904 welded stainless hlau yeeb nkab, 904L super austenitic yeeb nkab, ERW stainless yeeb nkab, EFW stainless yeeb nkab, acid resistant yeeb nkab, seawater resistant yeeb nkab. Daim ntawv pov thawj zeb EN 10204 3.1/3.2, hydro test, UT, solution annealed, beveled/plain ends, pickled finish muaj. Lub Hoobkas ncaj qha muab rau cov tshuaj lom neeg, marine, thiab offshore projects thoob ntiaj teb.

Xa email rau peb Cov Lus Qhia Txog Khoom

Cov Khoom Qhia Txog Khoom

Cov Cim Npe Khoom

1. Womic Steel: Kev Muaj Peev Xwm Tsim Khoom & Lub Zog ntawm Lub Tuam Txhab

Womic Steel Group yog lub chaw tsim khoom tseem ceeb thiab xa khoom thoob ntiaj teb nrog ntau tshaj 20 xyoo ntawm kev txawj ntse hauv kev tsim cov kav dej hlau uas tiv taus xeb. Peb lub chaw tsim khoom tshwj xeeb 904L welded yeeb nkab siv ntau yam thev naus laus zis vuam nrog kev tswj hwm nruj ntawm cov cua sov nkag thiab kev kho cua sov tom qab vuam:

● ERW (Fais fab tsis kam vuam) Kab:Rau cov kab uas hla ntawm 6.35mm txog 610mm (1/4″ - 24″), phab ntsa tuab ntawm 0.5mm txog 12.7mm. Kev vuam zaus siab nrog cov cua sov qis (≤ 1.2 kJ / hli) kom tsis txhob muaj kev sib cais ntawm cov ntsiab lus siab alloy. Zoo tagnrho rau cov kav dej me me mus rau nruab nrab txoj kab uas hla 904L.

●EFW (Fais Fab Fusion Vuam) Kab:Rau cov txoj kab uas hla ntawm 219mm txog 1219mm (8″ - 48″), phab ntsa tuab ntawm 4.0mm txog 40mm. TIG (GTAW) cov hauv paus hla nrog SAW sau hla, siv cov hlau sib phim (ERNiCrMo-3 lossis ER385).

●LSAW / SAWL Kab rau High Alloy:Rau cov kab uas hla ntawm 406mm txog 1219mm (16″ - 48″), phab ntsa tuab txog li 40mm. Kev vuam arc hauv qab ntawm cov phaj dov 904L nrog kev tswj cua sov.

Tag nrho cov kav dej 904L welded raug annealing (kev kho cua sov) ntawm 1050-1150 ° C ua raws li kev quenching dej kom yaj cov theem thib ob thiab rov qab kho qhov tsis kam corrosion, ua raws li pickling thiab passivation nrog cov kua qaub tshwj xeeb.

Cov Ntawv Pov Thawj Zoo & Kev Ua Raws Cai:

●ISO 9001: 2015 Daim Ntawv Pov Thawj

●PED 2014/68/EU (CE Marking) rau cov khoom siv siab

●EN 10204 3.2 Daim Ntawv Pov Thawj nrog kev lees paub los ntawm lwm tus (TÜV, BV, SGS, LR)

●Kev Tshuaj Xyuas Sab Nraud (TPI) tau pom zoo los ntawm SGS, BV, ABS, DNV, TÜV

●NACE MR0175 / ISO 15156 rau kev pabcuam qaub (H₂S) thaum thov

●ASME Boiler thiab Pressure Vessel Code (Tshooj VIII, Div. 1) thaum thov

Womic Steel muab cov kav dej 904L welded rau ntau tshaj 30 lub tebchaws thoob plaws kev lag luam tshuaj lom neeg, dej hiav txwv, thiab ntug dej hiav txwv.

Kev Yooj Yim Tsim Khoom:

●ERW: 6.35–610mm OD × 0.5–12.7mm WT × ≤ 12m

●EFW: 219–1219mm OD × 4.0–40mm WT × ≤ 12m (ntev dua yog thov)

●LSAW: 406–1219mm OD × 6.0–40mm WT × ≤ 18m

●Cov kev xaiv tiav: Annealed thiab pickled, ci annealed (rau cov raj me me)

2. ASTM B673 UNS N08904: Cov Khoom Siv Sib xyaw & Cov yam ntxwv ua tau zoo

UNS N08904 (904L) yog cov hlau stainless hlau super austenitic uas muaj nickel siab (23-28%), chromium siab (19-23%), molybdenum (4-5%), thiab tooj liab (1-2%). Qhov ntxiv tooj liab muab kev tiv thaiv zoo rau kev txo cov kua qaub xws li sulfuric thiab phosphoric acid. Cov molybdenum thiab chromium siab muab kev tiv thaiv pitting zoo heev hauv cov chaw chloride. 904L feem ntau yog siv ua lwm txoj hauv kev pheej yig rau cov hlau nickel hauv cov xwm txheej nruab nrab.

Cov Tshuaj Lom Zem (Kev Tshuaj Xyuas Ladle, % los ntawm pawg):

Khoom	UNS N08904 (904L)	316L (rau kev sib piv)
C	≤ 0.020	≤ 0.030
Mn	≤ 2.00	≤ 2.00
P	≤ 0.040	≤ 0.045
S	≤ 0.030	≤ 0.030
Si	≤ 1.00	≤ 1.00
Cr	19.0 – 23.0	16.0 – 18.0
Ni	23.0 – 28.0	10.0 – 14.0
Mo	4.0 – 5.0	2.0 – 3.0
Cu	1.0 – 2.0	—
Fe	Qhov Nyiaj Tshuav	Qhov Nyiaj Tshuav

Cov Khoom Siv Kho Tshuab (Chav Kub, Tshuaj Annealed):

Vaj tse	UNS N08904 (904L)
Lub Zog Tawm (qis tshaj, 0.2% offset)	220 MPa (31,900 psi)
Lub zog Tensile (min)	490 MPa (71,100 psi)
Kev ncua ntev (min, 50mm gauge)	35%
Qhov nyuaj (siab tshaj plaws)	90 HRB

Cov Khoom Siv Lub Cev:

Qhov Ceev: 8.00 g/cm³

Modulus ntawm Elasticity: 195 GPa (28.3 × 10⁶ psi)

Kev Ua Kub: 12.0 W/m·K ntawm 100°

Cov Coefficient ntawm Thermal Expansion: 15.4 × 10⁻⁶/°C (20-100°C)Kev Tiv Thaiv Kev Xeb:

Pitting Resistance Equivalent Number (PREN) = Cr% + 3.3(Mo%) + 16(N%) ≈ 35-40 (vs 316L PREN 24-26)

Kev tiv taus zoo heev rau sulfuric acid thoob plaws ntau qhov concentration (txog li 90% ntawm qhov kub nruab nrab)

Kev tiv thaiv zoo rau phosphoric acid (txheej txheem ntub dej) uas muaj chlorides thiab fluorides

Zoo heev tsis kam rau qhov xeb ntawm qhov pitting thiab crevice hauv cov chaw chloride

Zoo tiv taus rau intergranular corrosion tom qab welding (cov pa roj carbon tsawg)

Haum rau kev pabcuam qaub (NACE MR0175) nrog kev kho cua sov kom zoo

Cov Kev Txwv ntawm Kev Xeb (Kwv yees li):

● Cov kua qaub sulfuric (H₂SO₄): txog li 90% ntawm 50°C; txog li 70% ntawm 100°C

● Hydrochloric acid (HCl): txwv rau dilute (< 5%) ntawm chav tsev kub

● Phosphoric acid (H₃PO₄): zoo heev txog li 85% ntawm 100°C

● Acetic acid: zoo heev rau txhua qhov concentration

● Dej Hiav Txwv: zoo heev thaum kub txog li 50°C

3. Kev Ua Raws Li Qhov Ntev thiab Cov Qauv

Khoom	Cov Lus Qhia Tshwj Xeeb
Tus Qauv	ASTM B673 / ASME SB-673 (cov yeeb nkab vuam)
Cov Txheej Txheem Tsim Khoom	ERW, EFW, LSAW
Sab Nraud Txoj Kab uas hla	ERW: 6.35 - 610mm; EFW/LSAW: 219-1219mm
Phab ntsa tuab ntau yam	ERW: 0.5-12.7mm; EFW/LSAW: 4.0-40mm
Lub Sijhawm Teem Caij	5S, 10S, 40S (rau NPS 1/8″ - 48″)
Qhov Ntev Ntau	Txheem: 6m; Ncua: 12m, 18m, txog li 18m
Xaus tiav	Qhov Kawg Plain (PE), Qhov Kawg Beveled (BE)
Qhov Chaw Tiav	Annealed & Pickled, Bright Annealed
Kev kam rau siab	OD: ±0.5% lossis ±3.2 hli; WT: ±12.5% (ib qho ASTM B775); Ntev: +50 hli / -0 hli

4. Qhov Loj & Cov Lus Qhia Tshwj Xeeb - ASTM B673 UNS N08904 Cov Yeeb Nkab Hlau Stainless Hlau Welded (Xaiv Cov Qhov Loj Ib Txwm)

NPS	OD (hli)	Teem sijhawm	Qhov hnyav (hli)	Qhov hnyav (kg/m2)	Qhov Ntev Txheem	Daim Ntawv Thov Ib Txwm Muaj
1/2″	21.3	10S	2.11	1.00	6m	Kev siv tshuaj lom neeg
3/4″	26.7	10S	2.11	1.28	6m	Cov kab ntsuas
1″	33.4	10S	2.77	2.09	6m	Cov khoom noj uas muaj kua qaub
1-1/2″	48.3	10S	2.77	3.11	6m	Kab mob sulfuric acid
2″	60.3	10S	2.77	3.93	6m / 12m	Cov txheej txheem
3″	88.9	10S	3.05	6.46	6m / 12m	Kev hloov pauv kua qaub
4″	114.3	10S	3.05	8.37	6m / 12m	Cov kua qaub phosphoric
6″	168.3	10S	3.40	13.8	6m / 12m	Dej hiav txwv txias
8″	219.1	10S	3.76	20.0	12m	Offshore sour line
10″	273.0	10S	4.19	27.8	12m	Qhov chaw muag khoom FGD
12″	323.9	10S	4.57	36.0	12m	Tshuaj lom neeg tseem ceeb
16″	406.4	10S	4.78	47.4	12m	Txoj kab uas hla loj

*Muaj cov qhov loj me tshwj xeeb sab nraum cov no. Cov kav dej 904L welded yuav tsum siv sijhawm ntev dua (tsawg kawg 60 hnub) vim yog kev xaiv tshwj xeeb ntawm cov strip/phaj.*

5. Cov Qauv Super Austenitic & Qib Uas Womic Steel Tsim

Tus Qauv	Cov Qib Hlau / Alloy	Daim Ntawv Thov Ib Txwm Muaj	Txheej Txheem Vuam
ASTM B673	UNS N08904 (904L)	Sulfuric/phosphoric acid, dej hiav txwv	EFW/LSAW/ERW
ASTM B674	UNS N08904 (tsis muaj qhov sib txuas)	Cov yeeb nkab siab	-
ASTM B677	UNS N08904	Cov yeeb nkab tsis muaj qhov txuas	-
EN 10217-7	1.4539 (904L)	Lub hom phiaj siab, super austenitic	SAW/ERW
ASTM A312	UNS N08367 (AL-6XN), S31254 (254 SMO)	Dej Hiav Txwv, FGD	EFW/LSAW

Kev Siv:Cov nroj tsuag sulfuric acid, kev tsim cov phosphoric acid, FGD systems, dej hiav txwv txias (qhov kub siab), cov nkoj thauj tshuaj lom neeg, kev pabcuam dej hiav txwv.

6. Cov Txheej Txheem Tsim Khoom - Cov Yeeb Nkab Hlau Stainless Steel Welded (ERW, EFW, LSAW)

Kev vuam 904L xav tau kev tswj hwm qhov kub nkag thiab kev kho cua sov tom qab vuam vim nws cov ntsiab lus siab ntawm cov hlau alloy. Tooj liab thiab molybdenum ua rau cov hlau alloy yooj yim sib cais yog tias txias qeeb dhau.

ERW (Fais fab tiv taus vuam) Txheej Txheem - Me me mus rau nruab nrab txoj kab uas hla (6.35–610mm OD):

●Kev Tshuaj Xyuas Khoom Siv Raw (Strip / Coil):Daim kab xev 904L tau txheeb xyuas seb muaj pes tsawg (Ni 23-28%, Cr 19-23%, Mo 4-5%, Cu 1-2%). Txhua lub kauj muaj tus lej kub tshwj xeeb.

●Kev Tshem Tawm & Kev Sib Tw

●Kev Txiav Ntug Ntug

●Kev tsim:Kev tsim cov yob tas mus li.

●Kev Vuam Zaus Siab:Siv cua sov tsawg (≤ 1.2 kJ/mm2) kom tsis txhob muaj Cu/Mo sib cais. Vuam hauv huab cua inert.

●Kev Sib Dhos Seam:Induction annealing ua raws li dej quenching.

●Kev Loj thiab Kev Ncaj Ncees

●Txiav kom ntev

●NDT:Kev sim tam sim no eddy (100%) + xaiv tau UT.

●Kev Kho Mob Kub (Tag Nrho Cov Yeeb Nkab):1050-1150°C, dej tua. Yuav tsum tau yaj cov theem thib ob.

●Kev Ntsuas Hydrostatic

●Kev Ua Kua Txob thiab Kev Ua Kom Tsis Txhob Mob(tshwj xeeb sib xyaw acid rau cov hlau nplaum siab)

●PMI (XRF) & Kev kuaj xyuas qhov nyuaj

●Kev Tshuaj Xyuas Zaum Kawg & Kev Cim

EFW (Electric Fusion Vuam) Txheej Txheem - Txoj Kab uas hla loj (219–1219mm OD, 4.0–40mm WT):

●Kev Npaj Phaj:904L phaj, cov npoo beveled (X bevel).

●Kev Tsim Dov

●Kev Sib Txuas Tack

●TIG (GTAW) Root Pass:Cov khoom sib phim (ERNiCrMo-3 lossis ER385), argon backing gas.

●Daim Ntawv Sau & Lub hau ntawm SAW:Cov cua sov nkag ≤ 1.5 kJ/mm2, qhov kub thiab txias ntawm qhov nkag ≤ 120°C. Cov dej ntws tshwj xeeb uas muaj sulfur tsawg.

●Sab Hauv Weld

●Kev Kuaj Mob Xoo Hluav Taws Xob 100% + UT(ib qho ASTM B775)

●Kev daws teeb meem Annealing:Kev kho cua sov tag nrho cov yeeb nkab (1050-1150 ° C), dej tua.

●Kev Ua Kua Txob thiab Kev Ua Kom Tsis Txhob Mob

●Kev Ntsuas Hydrostatic

●PMI & Kev Tshuaj Xyuas Qhov Ntev

●Kev cim

Cov Txheej Txheem LSAW rau Cov Hlau Loj - Txoj Kab uas hla loj heev (406–1219mm OD, 6.0–40mm WT):

● UOE lossis JCOE tsim los ntawm 904L phaj

● Ob sab SAW vuam nrog kev tswj cua sov nruj

● Kev kho kom sov tag nrho tom qab vuam

Cov Ntsiab Lus Tswj Xyuas Tseem Ceeb rau 904L Vuam:

● Cov cua sov nkag: ≤ 1.5 kJ/mm (lub hom phiaj ≤ 1.2 kJ/mm)

● Kub ntawm qhov nkag mus: ≤ 120°

● Cov pa roj tiv thaiv: 100% Argon nrog cov pa oxygen

● Kev kub hnyiab ntawm cov tshuaj: 1050-1150°C, dej tua - yuav tsum tau ua

● Kev Sib Xyaws: Cov kua qaub sib xyaw tshwj xeeb rau cov hlau chromium/nickel siab

7. Kev Tswj Xyuas Zoo & Cov Txheej Txheem Ntsuas rau ASTM B673 UNS N08904 Welded Stainless Steel Pipe

Theem	Txoj Kev Tshuaj Xyuas	Lub Hom Phiaj
Cov Khoom Siv Raw	Kev Tshuaj Xyuas Tshuaj (OES lossis ICP)	Txheeb xyuas N08904 (Ni 23-28%, Cr 19-23%, Mo 4-5%, Cu 1-2%)
Cov Khoom Siv Raw	Kev Ntsuas Tensile	Tawm los ≥ 220 MPa, Tensile ≥ 490 MPa
Cov Khoom Siv Raw	Kev Ntsuas Kev Xeb (ASTM G28)	Kev tiv thaiv corrosion intergranular (rau kev pabcuam kua qaub)
Cov Khoom Siv Raw	Kev suav PREN	Xyuas kom tseeb tias PREN ≥ 35
Nyob rau hauv-Txheej Txheem	Kev Saib Xyuas Kub	≤ 1.5 kJ / hli
Nyob rau hauv-Txheej Txheem	Kub ntawm qhov sib tshuam	≤ 120 ° C
Vuam (ERW)	Eddy Tam Sim No (100%)	Kev ncaj ncees ntawm kev vuam
Kev vuam (EFW/LSAW)	100% UT (los yog PAUT)	Tshawb nrhiav qhov tsis zoo ntawm vuam
Kev vuam (EFW/LSAW)	RT (10-100% ib qho spec)	Qhov zoo ntawm vuam
Kev vuam	Cov Tshuaj Pleev Xim (PT)	Cov kab nrib pleb ntawm qhov chaw
Tom qab Annealing Solution	Kev Ntsuas Qhov Nyuaj	≤ 90 HRB
Tom qab Annealing Solution	Cov qauv me me (ASTM E407)	Tsis muaj sigma, chi, lossis theem thib ob
Cov Yeeb Nkab Tiav Lawm	Kev Ntsuas Hydrostatic	Kev ua siab ncaj ncees
Cov Yeeb Nkab Tiav Lawm	PMI (XRF)	Paub meej qib (Ni, Cr, Mo, Cu)
Cov Yeeb Nkab Tiav Lawm	Kev Ntsuas Kev Sib Tsoo Pitting (ASTM G48)	Xyuas kom meej tias qhov pitting tsis kam (yog tias tau teev tseg)
Cov Yeeb Nkab Tiav Lawm	Kev Pom thiab Kev Cim	Kev taug qab tau

Kev Xeem Xaiv Tau Rau Kev Pabcuam Tseem Ceeb:

● ASTM G28 Xyaum A (ferric sulfate-sulfuric acid) rau kev xeb intergranular

● ASTM G48 kev sim pitting hauv FeCl₃ (6% ntawm 40 ° C) rau kev pabcuam dej hiav txwv

● Kev kuaj HIC/SSC rau kev pabcuam qaub (NACE TM0284, TM0177)

● Kev sim tooj liab sulfate rau kev txo qhov tsis kam ntawm cov kua qaub

8. Cov Ntawv Thov Tseem Ceeb - ASTM B673 UNS N08904 Cov Yeeb Nkab Hlau Stainless Welded

●Cov nroj tsuag sulfuric acid:Siv cov kua qaub concentrated (90-98% H₂SO₄) ntawm qhov kub nruab nrab, dilute acid (5-10%) ntawm qhov kub siab, thiab cov kav dej txias acid. Hloov 316L thiab 317L.

●Kev tsim cov kua qaub phosphoric (txheej txheem ntub):Cov tshuab ua kom cov kua dej txias, cov tshuab ua kom txias sai, thiab cov kab hloov pauv uas tuav cov kua phosphoric acid nrog cov chlorides thiab fluorides. 904L yog tus qauv rau cov kua phosphoric acid uas ntub dej.

●Cov kav dej tawm ntawm cov pa roj flue desulfurization (FGD):Cov dej ntws hauv qab ntawm cov khoom nqus cua uas muaj cov pa roj chloride ntub dej. 904L yog siv rau cov kav dej tawm thiab cov kab sib dhos uas 317L tsis txaus.

●Cov tshuab cua txias dej hiav txwv (kub siab):Cov tshuab dej txias ntug dej hiav txwv uas qhov kub ntawm dej hiav txwv tshaj 40 ° C. 904L tiv taus qhov kub thiab txias uas 316L thiab txawm tias super duplex yuav ua tsis tiav.

●Cov nkoj thauj tshuaj lom neeg (IMO Hom II):Cov kav dej thauj khoom rau cov tshuaj lom neeg hnyav xws li sulfuric acid, phosphoric acid, thiab cov organic acids. 904L tau txais kev pom zoo los ntawm ntau lub tuam txhab thauj khoom tshuaj.

●Kev pabcuam Offshore:Kev tsim roj thiab roj av nrog H₂S siab thiab cov chlorides siab, tshwj xeeb tshaj yog qhov kub thiab txias nruab nrab tab sis qhov xav tau xeb ntau dua duplex.

●Cov nroj tsuag ua cov tshuaj dawb rau cov pulp thiab ntawv:Kev pabcuam chlorine dioxide thiab sodium hypochlorite qhov twg 317L tsis txaus.

●Cov khoom siv tshuaj:Cov reactors thiab cov kav dej rau cov txheej txheem uas muaj cov kua qaub muaj zog.

●Cov khoom siv zas xim textile:Cov tshuab zas xim uas siv cov tshuaj chlorine dyes.

●Kev ua zaub mov:Cov kua ntsev uas muaj chloride ntau, cov kua txiv qaub, thiab cov khoom noj uas muaj kua qaub ntau.

9. Ntim & Xa Khoom - JIS A5525 SKK490 SSAW Steel Pile Pile

Ntim:

●Kev tiv thaiv xeb:Yas qhwv los yog ntawv VCI. Tsis muaj roj seem rau kev siv tshuaj lom neeg.

●Cov hau kawg:Cov hau yas ruaj khov (xim coded - feem ntau yog xiav rau 904L).

●Kev Sib Txuas (Cov kab uas hla me me):Txhua lub yeeb nkab raug qhwv ib tus zuj zus, tom qab ntawd muab cov hlua khi uas tsis yog hlau khi ua ke.

●Kev ntim khoom ib leeg (Cov kab uas hla loj):Yas zaj duab xis qhwv nrog cov nplhaib ua npuas ncauj.

●Cov thawv ntoorau cov tshuaj lom neeg tseem ceeb thiab cov haujlwm hauv hiav txwv.

Kev Xa Khoom:

Cov thawv rau ≤ 610 hli, cov khoom tawg rau cov kab uas hla loj dua.

Cov ntaub ntawv pov thawj:MTC 3.1/3.2, daim ntawv qhia txog kev kuaj dej, daim ntawv qhia UT/RT, daim ntawv qhia PMI, daim ntawv qhia txog kev kuaj xeb (yog tias teev tseg), daim ntawv qhia qhov ntev, daim ntawv teev cov khoom ntim, COO. Kev taug qab tag nrho los ntawm tus lej cua sov mus rau cov yeeb nkab tiav.

10. Cov txiaj ntsig ntawm Womic Steel & FAQ - ASTM B673 UNS N08904 Welded Pipe

Vim li cas thiaj koom tes nrog Womic Steel rau 904L Welded Pipe?

● Qhov Loj Tag Nrho: ERW 1/4″ – 24″, EFW/LSAW 8″ – 48″.

● Kev ua kom cov kua kub tag nrho tom qab vuam (1050-1150°C, dej tua).

● Kev kuaj xeb hauv tsev (ASTM G28, G48) rau kev pabcuam kua qaub thiab dej hiav txwv.

● PREN ≥ 35 - zoo heev pitting kuj.

● Lub sijhawm ua khoom sib tw: 60-75 hnub rau ERW, 75-90 hnub rau EFW/LSAW.

● Daim ntawv pov thawj thoob ntiaj teb: ISO 9001, PED (CE), EN 10204 Hom 3.2.

Cov Lus Nug Feem Ntau (FAQ) - ASTM B673 UNS N08904 Cov Yeeb Nkab Welded

Q: Qhov txawv ntawm 904L thiab 316L yog dab tsi?
A: 904L muaj nickel ntau dua (23-28% vs 10-14%), chromium ntau dua (19-23% vs 16-18%), molybdenum ntau dua (4-5% vs 2-3%), thiab ntxiv tooj liab (1-2%). Qhov no muab 904L zoo dua tiv taus sulfuric acid, phosphoric acid, thiab pitting hauv chlorides. PREN yog 35-40 vs 24-26 rau 316L. 904L yog kwv yees li 3-4 npaug ntawm tus nqi ntawm 316L thiab siv qhov twg 316L tsis ua haujlwm.

Q: 904L puas haum rau kev pabcuam dej hiav txwv?
A: Yog. 904L muaj kev tiv thaiv zoo heev rau kev xeb ntawm qhov pitting thiab crevice hauv dej hiav txwv txog li qhov kub ntawm kwv yees li 50 ° C. Rau qhov kub siab dua lossis cov xwm txheej tsis ruaj khov, tej zaum yuav xav tau super duplex lossis nickel alloys. 904L feem ntau siv rau cov tshuab txias dej hiav txwv uas 316L tsis ua haujlwm.

Q: Qhov kub siab tshaj plaws rau 904L hauv sulfuric acid yog dab tsi?
A: Hauv 50-70% H₂SO₄, 904L siv tau txog li 100°C. Hauv 90-96% H₂SO₄, txwv tsis pub tshaj 50-60°C. Rau qhov kub siab dua lossis muaj kua qaub ntau dua, yuav tsum muaj cov hlau nickel siab (Alloy 20, Alloy 625, Alloy C-276). Ib txwm saib cov ntawv qhia xeb rau cov xwm txheej tshwj xeeb.

Q: Puas yog 904L xav tau kev daws teeb meem tom qab vuam?
A: Yog, raws li ASTM B673. 904L tuaj yeem tsim cov theem thib ob (sigma, chi) hauv qhov vuam HAZ yog tias txias qeeb. Kev daws teeb meem annealing ntawm 1050-1150 ° C ua raws li dej quench yaj cov theem no thiab rov qab kho qhov tsis kam corrosion. Womic ua tiav kev daws teeb meem annealing ntawm txhua lub kav dej welded 904L. Rau kev vuam teb, siv cov cua sov qis thiab xav txog kev daws teeb meem tom qab vuam yog tias ua tau.

Q: Cov hlau vuam twg raug pom zoo rau 904L?
A: AWS A5.14 ERNiCrMo-3 (Inconel 625) lossis ER385 raug pom zoo. ERNiCrMo-3 feem ntau siv thiab muab kev tiv thaiv corrosion zoo sib xws 904L. ER385 yog ib qho tshwj xeeb 904L phim filler. Womic siv ERNiCrMo-3 rau EFW cov txheej txheem.

Q: Puas yog 904L haum rau kev pabcuam qaub (H₂S)?
A: Yog, 904L tau tsim nyog raws li NACE MR0175/ISO 15156 rau kev pabcuam qaub nrog H₂S ib nrab siab txog li 1 bar (15 psi) hauv cov qib hardness tshwj xeeb. Nws feem ntau siv rau hauv cov teb qaub nruab nrab qhov twg duplex tsis txaus vim muaj chlorides ntau.

Q: Lub sijhawm ua khoom siv rau 904L welded yeeb nkab yog dab tsi?
A: 60-75 hnub rau ERW (cov kab uas me mus rau nruab nrab), 75-90 hnub rau EFW/LSAW (cov kab uas loj). Lub sijhawm ua cov hlau tsis xeb yog ntev dua li cov hlau tsis xeb ib txwm vim yog kev tshwj xeeb ntawm cov hlau sib xyaw / phaj (feem ntau yog 12-16 lub lis piam los ntawm lub Hoobkas). Kev tshuaj xyuas sab nraud ntxiv 7-14 hnub.

Q: Puas siv tau 904L rau cov dej huv siab?
A: Yog, tab sis feem ntau nws yog qhov teev tseg ntau dhau. Rau cov dej ntshiab siab (RO, DI, WFI), 316L txaus thiab pheej yig dua. 904L yog tseg rau cov tshuaj lom neeg hnyav lossis cov tshuaj chloride siab.

Cov Lus Qhia Txog Qhov Project - Kev Hloov Cov Kav Dej Txias Uas Muaj Acid Sulfuric Acid Hauv Tebchaws Europe

Lub Tebchaws:Lub Tebchaws Yelemees (North Rhine-Westphalia, cov tshuaj lom neeg sib xyaw)
Tus Qauv & Qib:ASTM B673 UNS N08904 (904L) - cov yeeb nkab vuam
Qhov Loj & Qhov Ntau:

● OD 88.9mm (3″) × Schedule 10S (3.05mm WT) – 600 meters (kwv yees li 5 tons) – ERW txheej txheem

● OD 114.3mm (4″) × Schedule 10S (3.05mm WT) – 500 meters (kwv yees li 6 tons) – ERW txheej txheem

● OD 168.3 hli (6″) × Schedule 10S (3.40 hli WT) – 300 meters (kwv yees li 4 tons) – EFW txheej txheem

● OD 219.1mm (8″) × Schedule 10S (3.76mm WT) – 200 meters (kwv yees li 4 tons) – EFW txheej txheem
Tag Nrho:1,600 meters, kwv yees li 19 tons

Cov Lus Qhia:ASTM B673 UNS N08904 cov tshuaj annealed thiab pickled, beveled kawg. Hydrostatic kev kuaj ntawm 1.5 × tsim siab (tsim 1.2 MPa). 100% UT rau EFW kav dej, eddy tam sim no rau ERW. PMI ntawm txhua kav dej. Yuav tsum tau kuaj xeb raws li ASTM G28 Xyaum A (ferric sulfate-sulfuric acid) - tus nqi xeb < 5 mpy (ua tiav 2-3 mpy). Pitting xeb kev kuaj raws li ASTM G48 Txoj Kev A (6% FeCl₃, 24h ntawm 40 ° C) - tsis muaj pitting. Intergranular xeb kev kuaj raws li ASTM A262 Xyaum E (dhau). Kev tshuaj xyuas sab nraud los ntawm TÜV Lub Tebchaws Yelemees.

Daim Ntawv Thov:Kev hloov cov kav dej txias kua qaub thiab cov kab hloov pauv cuam tshuam hauv lub Hoobkas rov ua kua qaub sulfuric. Cov kav dej no tuav cov kua qaub sulfuric kub (85-93% H₂SO₄) ntawm 70-90 ° C los ntawm lub pej thuam nqus mus rau lub tshuab txias kua qaub. Cov kav dej 316L yav dhau los tsis ua haujlwm tom qab 18 lub hlis vim muaj kev xeb dav dav thiab cov qhov. 904L tau raug xaiv rau nws qhov kev tiv taus zoo rau cov kua qaub sulfuric concentrated ntawm qhov kub siab.

Cov Kev Sib Tw thiab Kev Dais Teeb Meem:

●Kev xeb hauv cov kua qaub sulfuric kub (85-93%, 70-90 ° C)- 316L xeb ntawm tus nqi > 50 mpy nyob rau hauv cov xwm txheej no. 904L nrog nws cov nickel siab, chromium, molybdenum, thiab tooj liab muab tus nqi xeb < 5 mpy. Womic ua ASTM G28 Xyaum A kev sim ntawm cov hlau puag thiab cov qauv vuam. Tus nqi xeb: hlau puag 2.1 mpy, vuam 2.8 mpy - qis dua 5 mpy txwv. Tus neeg siv khoom pom zoo.

●Kev tiv thaiv corrosion ntawm cov hlau vuam– Qhov vuam yog thaj chaw uas muaj kev phom sij tshaj plaws. Womic siv cov cua sov qis (≤ 1.2 kJ/mm) thiab ERNiCrMo-3 filler. Cov qauv vuam tau dhau qhov kev sim G28 nrog tus nqi xeb 2.8-3.2 mpy. Microstructure tsis qhia txog theem thib ob nag lossis daus.

●Kev tiv thaiv pitting ntawm qhov kub siab– Cov kua qaub muaj cov tshuaj chlorides me me (los ntawm qhov chaw dej). 904L's PREN 35-40 muab kev tiv thaiv pitting. Womic tau ua qhov kev sim pitting G48 ntawm 40 ° C (hnyav dua li qhov kub thiab txias 70 ° C? Qhov tseeb, qhov kub thiab txias xeem 40 ° C qis dua, tab sis FeCl₃ yog qhov hnyav). Qhov tshwm sim: tsis muaj pitting tom qab 72 teev.

●Intergranular xeb tom qab vuam– 904L muaj cov pa roj carbon tsawg (≤ 0.020%), tab sis tseem xav tau kev kho kom sov. Womic ua tiav kev kho kom sov tag nrho ntawm 1100 ° C, dej quench. ASTM A262 Practice E xeem dhau.

●Cov txheej txheem vuam teb– Pab pawg saib xyuas lub Hoobkas xav tau WPS uas tsim nyog los kho. Womic tau muab 15 daim coupon weld nrog WPS siv GTAW, ERNiCrMo-3 filler, preheat 10-20°C, interpass ≤ 120°C, heat input ≤ 1.2 kJ/mm. Cov coupon tau dhau RT, PT, thiab G28 kev sim.

●Kev xa khoom mus rau lub Hoobkas tshuaj lom neeg hauv tebchaws Yelemees– Cov kav dej xa los ntawm Shanghai mus rau chaw nres nkoj Hamburg, tom qab ntawd thauj mus rau qhov chaw. TÜV Lub Tebchaws Yelemees tau tshuaj xyuas cov kav dej ntawm Hamburg. Tag nrho 19 tons xa tuaj tsis pub dhau 10 lub lis piam. Pob ntawv sau (MTC 3.2, cov ntawv qhia kev sim) xa tuaj hauv hluav taws xob.

Qhov Tshwm Sim:Cov kav dej 904L tshiab tau teeb tsa thaum lub sijhawm Q3 2024 tig rov qab. Tom qab 12 lub hlis ntawm kev ua haujlwm, kev tshuaj xyuas tsis pom muaj xeb ntsuas tau, tsis muaj qhov pitting, thiab tsis muaj qhov xau. Tus neeg siv khoom xav tias yuav siv tau 15+ xyoo (piv rau 1.5 xyoo rau 316L). Womic Steel tam sim no yog tus neeg muag khoom tsim nyog rau lub Hoobkas tshuaj lom neeg no cov kav dej sulfuric acid.

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