GOST 8731 seamless alloy steel pipe

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GOST 8731 seamless alloy steel pipe
Posting date : Aug 27, 2012
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Seamless Steel Pipe GOST 8732,8731 Seamless Steel Pipe Steel35 C 0,32 - 0,40 Mn 0,50 - 0,80 Si 0,17 - 0,37 P 0,035 S 0,04Cr 0,25 CHEMICAL PROPERTIES Steel Grade Chemical composition (by %) C Mn Si P (max) S (Max) Cr (max) 10 1,07 - 0,14 0,35 - 0,65 0,17 - 0,37 0,035 0,04 0,15 20 0,17 - 0,24 0,35 - 0,65 0,17 - 0,37 0,035 0,04 0,25 35 0,32 - 0,40 0,50 - 0,80 0,17 - 0,37 0,035 0,04 0,25 45 0,42 - 0,50 0,50 - 0,80 0,17 - 0,37 0,035 0,04 0,25 20X 0,17 - 0,23 0,50 - 0,80 0,17 - 0,37 0,035 0,035 0,70 - 1,00 MECHANICAL PROPERTIES Steel Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation (by %) 10 353 216 24 20 412 245 21 35 510 294 17 45 588 323 14 20X 431 - 16 SIZE TOLERANCE External Diameter Tolerance % Wall Thickness Tolerance %   High Accuracy Ordinary Accuracy High Accuracy Ordinary Accuracy to 219 inc. +/- 0,8 +/- 1,0 to 15 inc. +/- 12,5 -15,0 / +12,5 above 15 to 30 -12,5 / +10 +/- 12,5 30 and above +/- 10,0 -12,5 / +10,5 above 219 +/- 1,0 +/- 1,25 to 15 inc. -15,0 / +12,5 above 15 to 30 - / + 12,5 30 and above -12,5 / +10,00

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