Hebei Shengtian group to introduce different precision steel pipe and seamless steel pipe:
1, and seamless steel tube is obviously the difference is: the size of high accuracy, can reach 0.05mm.
2, precision steel tube inner diameter surface finish high, customers without the need to process can be directly used; and ordinary seamless steel pipe need to customers and then lathe, polishing and other processing.
Material: alloy structural steel grades: 14CrMnMoVB precision seamless steel tube] precision seamless steel tube characteristics and scope of application: is the yield strength of 686MPa level suitable for welding of low alloy high strength steel, with good comprehensive mechanical properties. After different heat treatment, the mechanical properties of different composite can be obtained, which can be applied to different working conditions.. Its corrosion resistance is higher than mild steel (about three times). Applicable to all kinds of pressure vessel and engineering Mining machinery and truck parts and so on.
The chemical composition of the precision seamless steel tube:
C:0.10 ~ 0.15 silicon Si:0.17 ~ 0.37 Mn Mn:1.10 ~ 1.60 sulfur s: < 0.035 P: < 0.035 chromium Cr:0.90 ~ 1.30 v v:0.03 ~ 0.06 molybdenum Mo:0.32 ~ 0.40 boron B:0.002 ~ 0.006
The mechanical properties of precision seamless steel tube:
Tensile strength (o b (MPA):868 conditions yield strength sigma 0.2 (MPA):713 elongation and 5 (%): 17 elongation and 10 (%) in 11 section shrinkage rate psi (%): 62 impact toughness values alpha Ku (J / cm2): Fifty sample size: a sample
- precision seamless steel tube heat treatment andmicrostructure: heat treatment specification: 900 C 600 C normalizing, tempering. Microstructure: a small amount of tempered bainite in tempering bainite.