ZHENGZHOU SEAMLESS PIPES

ZHENGZHOU SEAMLESS PIPES. Processing mode Diameter Length Linearity Precision Roughness of inner hole Cold rolling 30-100 ≤12M 0.3-1.0 H8-H10 0.4-1.6 Cold drawn 30-250 ≤12M H8-H10 0.8-1.6 Grinding 40-500 ≤12M 1000 H8-H9 0.4-0.8 Rolling 40-400 ≤7M H8 0.4 Mechanical performance Model Item Cold drawn (rolling) tube metallic cut pipe 20 Intensity of tensionσbN/mm2 ≥510 ≥390 Elongationrate δ5% ≥5 ≥20 45 Intensity of tension σbN/mm2 ≥647 ≥590 Elongationrateδ5% ≥4 ≥4 16Mn Intensity of tensionσbN/mm2 ≥640 Elongationrateδ5% ≥10 27SiMn Intensity of tensionσbN/mm2 ≥840 Elongationrateδ5% ≥7.5 Size tolerance Inner diameter warp of wall thickness H8 H9 H10 30 +0.033 0 +0.052 0 +0.084 0 ±5% 30-50 +0.039 0 +0.062 0 +0.100 0 50-80 +0.046 0 +0.074 0 +0.120 0 80-120 +0.054 0 +0.087 0 +0.140 0 120-180 +0.063 0 +0.100 0 +0.160 0 180-250 +0.072 0 +0.115 0 +0.185 0 250-315 +0.081 0 +0.130 0 +0.210 0 315-400 +0.089 0 +0.140 0 +0.230 0