20# steel pipe production process
Characteristics and scope of application: The energy is slightly higher than that of No. 15 stel, it's far rarely quenched, and there's no mood britleness. Colo deformation plasticity is excessive, usually for bending, calendering, crimping and hammer arching. The welding performance of arc welding and phone welding is good. The thickness of fuel welding is small, and the form is strict or the form is complicated. The machinability bloodless drawn or normalzed country is better than the annealed country, and is commonly used for production with low pressure and high durability reauirements.Chemical composition: Carbon C: 0.17 ~ 0.24" silicon Si: 0.17 ~ 0.37 manganese Mn: 0.35 ~ 0.sixty five sulfur S: s0.half phosohorus P: s0.1/2 chromium Cr:s 0.2 nickel Ni: s0.25 copper Cu: 50.25Mechanical properties: Tensile power ob (MPal: 2 410 (42) Yield energy os (MPal: 2 245 (25) Elongation 55 (%): 2 25 section shrinkage 山 (%): 2 5. Hardness.Not warmth treated. S 156HB, pattern length: sample size 25mmHeat treatment specification and metallographic organization: Heat treatment specification: normalizing, 910 C, air cooling. Metallographic organization: ferrite + pearlite.Deliverv status: Delivery with out heat remedy or warmness treatment (annealing, normalizing or high temperature tempering). The deliverv of the desired warmness.remedy condition will be indicated within the settlement and the unsnecified will be added with out warmness remedy.