Honed Tube

Standard:DIN2391,EN10305,JISG3445,ASTMA519,GB3639,16Mn,27SiMn,25Mn,SAE1026 Material:ST45，ST52，20 #，45#，CK45，16Mn,27SiMn,25Mn,SAE1026 Delivery condition:BKS Outer diameter:50-300mm Inner diameter:40-250mm I.D. Tolerance:H8~H9 Length:3-9m Straightness:1/1000 I.D. roughness:RA 0.4micron(max) Technology:Honed & SRB(SKIVED AND ROLLER BURNISHED ) Chemical Composition(%) Steel Grade C Si Mn P(≦) S(≦) Cr(≦) ST45 0.17-0.24 0.17-0.37 0.35-0.65 0.035 0.035 0.250 ST52(E355) ≦0.22 ≦0.55 ≦1.6 0.025 0.025 0.250 SAE1026 0.22-0.28 0.15-0.35 0.60-0.90 0.040 0.050 / 27SiMn 0.24-0.32 1.10-1.40 1.10-1.40 0.035 0.035 0.300 20# 0.17-0.24 0.17-0.37 0.35-0.65 0.035 0.035 0.250   Mechanical Properties Delivery condition:BKS Cold Drawn&Stress-Relieved Steel Grade Rm MPa(≥) ReH MPa(≥) Elongation A5(%)(≥) ST45 520 375 15 ST52(E355) 600 520 14 SAE1026 600 510 15 16Mn 600 520 14 20# 520 375 15