20 # seamless steel yeeb nkab yog siv rau hauv kev ua thiab kev tsim cov khoom siv tshuab. Feem ntau, lub nplhaib zoo li qhov chaw, cov khoom siv kho tshuab, cov yeeb nkab fittings, thiab tubular mechanical qhov chaw tuaj yeem ua tiav thiab tsim los ntawm cov kav dej seamless. Yog tias tsis muaj cov cai tshwj xeeb rau cov khoom siv kho tshuab, feem ntau 20 # Seamless steel kav tuaj yeem tsim ua cov khoom siv raw. Seamless steel yeeb nkab yog cov khoom siv raw rau kev siv tshuab, thiab 20 # seamless steel yeeb nkab yog cov khoom siv feem ntau.
Thib ob, 20 # seamless steel yeeb nkab tuaj yeem siv rau cov qauv steel, pob txha, kab, thiab lwm yam. Feem ntau ntawm cov kav dej seamless steel siv hauv cov qauv steel thiab cov tsev yog 20 # seamless steel kav, thiab qee qhov siv Q345B seamless steel kav vim muaj zog xav tau. Tsis tas yuav siv seamless steel kav hauv qee qhov haujlwm steel qauv. Lawv feem ntau siv cov kav dej welded. Cov kav dej welded muaj qhov tsis zoo. Lawv tsis tuaj yeem ua kom tuab dua 14mm. Seamless steel kav yuav tsum tau siv rau cov kav dej tuab.
20 # tshuaj muaj pes tsawg leeg
Table 1, Tshuaj muaj pes tsawg leeg ntawm 20 # Seamless Steel Yeeb Nkab
| Txuj | Tshuaj muaj pes tsawg leeg | |||||||||
| C | Si | Mn | Cr | Mo | Ni | Cu | V | P | S | |
| Tsawg dua los yog sib npaug | ||||||||||
| GB / T8163 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 0.25 | -- | 0.30 | 0.25 | -- | 0.035 | 0.035 |
| GB/T 9948 | 0.15 | 0.25 | 0.20 | 0.08 | 0.025 | 0.015 | ||||
| GB/T 6479 | ||||||||||
20 # mechanical zog (mechanical properties)
Rooj 2, Mechanical Properties of 20 # Seamless Steel Pipe
| Txuj | Mechanical Properties | |||||||
| Tensile zog / MPa | Yield zog / MPa | Elongation | KV2/J | |||||
| S Tsawg dua los yog sib npaug li 16 hli | 16-30 hli | ≥30mm | Portrait | Hloov | Portrait | Hloov | ||
| Ntau dua lossis sib npaug | Ntsuas kub / degree 0 degree | |||||||
| GB / T8163 | 410-530 | 245 | 235 | 225 | 20 | --- | ||
| GB/T 9948 | 410-550 | 245 | 24 | 22 | Ntau dua lossis sib npaug li 40 | Ntau dua lossis sib npaug 27 | ||
| GB/T 6479 | 410-550 | 245 | 16-40 hli | ≥40mm | 24 | 22 | Ntau dua lossis sib npaug li 40 | Ntau dua lossis sib npaug 27 |
| 235 | 225 | |||||||
