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27SiMn Hot Rolled Seamless Alloy Steel Pipe Manufacturer The material of alloy seamless steel pipe is roughly: 16-50Mn, 27SiMn, 40Cr, 12-42CrMo 16Mn 12Cr1MoV T91 27SiMn 30CrMo 15CrMo 20G Cr9Mo ...