Chemical Composition Requirements,%,
C: ≤0.30
Hnub: 0.29-1.06
P: ≤0.025
S: ≤0.025
Si: ≥0.10
Tsis muaj: ≤0.40
Cr: ≤0.30
Kub: ≤0.40
V: ≤0.08
Nb: ≤0.02
Mo: ≤0.12
* Manganese cov ntsiab lus yuav nce 0.05% rau txhua 0.01% txo cov ntsiab lus carbon mus txog 1.35%.
** Niobium cov ntsiab lus, raws li kev pom zoo, tuaj yeem nce mus txog 0.05% rau kev soj ntsuam yaj thiab 0.06% rau kev soj ntsuam cov khoom tiav.
Kev kho cua sov yuav tsum:
1. Ua kom kub siab tshaj 815 ° C.
2. normalize saum 815 ° C, ces temper.
3. Kub tsim ntawm 845 thiab 945 ° C, tom qab ntawd txias hauv qhov cub kub siab tshaj 845 ° C (rau cov hlab seamless nkaus xwb).
4. Machined thiab ces tempered raws li saum toj no Point 3.
5. Hardened thiab ces tempered saum 815 ° C.
Mechanical Performance Requirements:
Yield zog: ≥240Mpa
Tensile zog: ≥415Mpa
Elongation:
| Qauv | A333 GR.6 | |
| Ntsug | Hloov | |
| Yam tsawg kawg nkaus tus nqi ntawm tus qauv voj voogcov qauv los yog cov qauv me me nrog cov cim nrug ntawm 4D | 22 | 12 |
| Rectangular specimens nrog phab ntsa thicknesses ntawm 5/16 in. (7.94 mm) thiab ntau dua, thiab tag nrho cov qauv me me tau kuaj hauvtag nrho hla ntu ntawm 2 nti (50 mm)cov cim | 30 | 16.5 ib |
| Rectangular specimens mus txog 5/16 in. (7.94 mm) phab ntsa thickness ntawm 2 in. (50 mm) marking nrug (specimen width 1/2 in., 12.7 mm) | A | A |
A Tso cai rau 1.5% txo qhov ntev ntawm qhov elongation thiab 1.0% txo ntawm kev sib hloov elongation rau txhua 1/32 hauv. (0.79 hli) ntawm phab ntsa thickness mus txog 5/16 in. (7.94 mm) los ntawm cov elongation qhov tseem ceeb teev saum toj no.
Impact Test
Kev ntsuas kub: -45 ° C
Thaum siv cov qauv me me Charpy thiab qhov dav dav ntawm qhov dav yog tsawg dua 80% ntawm qhov tseeb tuab ntawm cov khoom, qhov ntsuas kub qis dua yuav tsum tau siv raws li suav hauv Table 6 ntawm ASTM A333 specification.
| Sample, mm | Qhov nruab nrab tsawg kawg ntawm peb tus qauv | Yam tsawg kawg nkaus tus nqi ntawme of peb lub qauv |
| 10 × 10 | 18 | 14 |
| 10 × 7.5 | 14 | 11 |
| 10 × 6.67 | 12 | 9 |
| 10 × 5 | 9 | 7 |
| 10 × 3.33 | 7 | 4 |
| 10 × 2.5 | 5 | 4 |
Cov kav hlau yuav tsum tau kuaj hydrostatically lossis tsis yog kev puas tsuaj (eddy tam sim no lossis ultrasonic) ntawm ceg ntawm ceg.
Kev kam rau siab ntawm sab nraud ntawm cov yeeb nkab steel:
| Sab nraud txoj kab uas hla, mm | zoo kam rau ua, mm | tsis zoo kam rau ua, mm |
| 10.3-48.3 Nws | 0.4 | 0.4 |
| 48.3 ib＜D≤114.3 | 0.8 ua | 0.8 ua |
| 114.3 ib＜D≤219.10 | 1.6 | 0.8 ua |
| 219.1 ib＜D≤457.2 | 2.4 | 0.8 ua |
| 457.2 ib＜D≤660 | 3.2 | 0.8 ua |
| 660＜D≤864 | 4.0 | 0.8 ua |
| 864 ib＜D≤1219 | 4.8 | 0.8 ua |
Phab ntsa thickness kam rau ua ntawm steel yeeb nkab:
Ib qho taw qhia yuav tsum tsis pub tsawg dua 12.5% ntawm nominal phab ntsa thickness.Yog hais tias qhov tsawg kawg nkaus phab ntsa thickness raug txiav txim, tsis muaj taw tes yuav tsum tsawg tshaj li qhov yuav tsum tau phab ntsa thickness.
Post lub sij hawm: Feb-22-2024