Seamless steel pipe for coal mine is mainly used to manufacture seamless pipe for hydraulic prop in coal mine.
Grade of high-quality carbon structural steel: 20#、35#
C | Si | Mn | Nb | RE | Cr | Ni | Cu | Mo | P | S | |
20 | 0.17-0.23 | 0.17-0.37 | 0.35-0.65 | 一 | 一 | <0. 25 | <0. 25 | <0. 20 | 一 | <0. 035 | <0. 035 |
35 | 0.32-0.39 | 0.17—0. 37 | 0. 50一0.8 | 一 | 一 | <0. 25 | <0. 25 | <0. 20 | 一 | <0. 035 | <0. 035 |
45 | 0.42-0.50 | 0.17 一0. 37 | 0.50 一0.8 | 一 | 一 | <0. 25 | WO. 25 | WO. 20 | 一 | <0. 035 | <0. 035 |
27SiMn | 0.24-0.32 | 1.10 一1.4 | 1.10 一1.4 | 一 | 一 | W0. 30 | <0.30 | <0. 20 | <0.15 | <0. 035 | <0. 035 |
30MnNbREa | 0.27-0.36 | 0. 20一0. 60 | 1.20 一1. 60 | 0.020一0. 050 | 0. 02一0. 04 | <0.30 | <0.30 | <0. 20 | <0.15 | <0. 035 | <0. 035 |
a The content of re is calculated as 0.02% ~ 0.04% added to the molten steel. |
Mechanical Property | |||||||
Grade | Tensile strength | Yield | Elong after fracture | Reduction of area | Shork absorption energy (KV2)/J | ||
Rm/MPa | MPa | A/% | Z/% | ||||
Steel tube wall thickness/mm | |||||||
<16 | >16 〜30 | >30 | |||||
no more less | |||||||
20 | 410 | 245 | 235 | 225 | 20 | — | |
35 | 510 | 305 | 295 | 285 | 17 | — | — |
45 | 590 | 335 | 325 | 315 | 14 | — | — |
27SiMn | 980 | 835 | 12 | 40 | 39 | ||
30MnNbRE | 850 | 720 | 13 | 45 | 48 |
In addition to ensuring the chemical composition and mechanical properties, the steel pipe directly rolled with ingot shall be subject to low power inspection.
Supply Ability: 2000 Tons Per Month Per Grade of Seamless steel tubes for coal mining.
In Bundles And In Strong Wooden Box
7-14 days if in stock, 30-45 days to produce
30% depsoit, 70% L/C or B/L copy or 100% L/C at sight