27SiMn, alloy structural steel. Uniform digital code: A10272 Standard: GB / T 3077-1999 
 [Main features] of this steel is superior to 30Mn2 steel, high hardenability, the critical quenching diameter in water up to 8 ~ 22mm, can cut good, cold plastic deformation and welding of medium; other toughness of steel during heat treatment reduce the small, but very high strength and wear resistance, especially when there are high water quenching toughness; point, but the sensitivity of this steel dialogue large, tend to temper embrittlement when heat treatment and thermal sensitivity. 
 [Application examples] of this steel is mainly used in the quenched state, required for the manufacture of high toughness and wear resistance of hot stamping; can also supply hot-rolled state normalizing or use, such as tractors and other off the track. 27simn and the application of an ordinary steel pipe, fluid seamless steel pipe: GB8163-2008 2, boiler seamless steel pipe: GB3087-2008 3, with high-pressure boiler seamless pipe: GB5310-2008 (ST45.8-Ⅲ type) 4. Fertilizer equipment high pressure seamless steel: GB6479-2000 5, geological drilling seamless steel pipe: YB235-70 6, seamless steel pipe oil drilling: YB528-65 7, seamless steel pipe for petroleum cracking: GB9948-88 8, oil specialized seamless pipe drill collar: YB691-70 9, automotive axle seamless steel pipe: GB3088-1999 10, seamless steel pipe for ship: GB5312-1999 11, cold-drawn cold-rolled precision seamless steel pipe: GB3639-1999 of alloy tube 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo steel according to different production processes are divided into two types of seamless and welded steel pipe. Seamless steel pipe from steel ingot, billet or perforated steel bar made of seamless steel pipes. The main pipe for hydraulic pillar. 27SiMn seamless steel pipe weight formula: [(OD - Wall Thickness) * Thickness] * 0.02466 = kg / m (per meter weight) 27siMn seamless steel pipe 
 Material: 27SiMn (GB/T17396-1998) Material: 27SiMn (GB/T17396-1998) Material: 27SiMn (GB/T17396-1998) Material: 27SiMn (GB/T17396-1998) 
 Specifications Specifications Specifications Specifications 
 83 * 13 127 * 10 168 * 20 245 * 27 
 83 * 14 127 * 17 168 * 32 245 * 32 
 89 * 16 133 * 16 180 * 21 273 * 27 
 95 * 9.2 133 * 16 180 * 22 273 * 30 
 95 * 10 133 * 22 180 * 25 273 * 36 
 95 * 15 140 * 18 180 * 40 299 * 30 
 102 * 14 146 * 14194 * 21325 * 30 
 9.2 114 * 152 * 17 203 * 26 377 * 35 
 114 * 10 159 * 16219 * 22377 * 28 
 114 * 19 159 * 21 219 * 25 
 121 * 14 168 * 18 232 * 31 

 Chemical composition 
 [Chemical composition] (wt) (%) C: 0.24 ~ 0.32 Si: 1.10 ~ 1.40 Mn: 1.10 ~ 1.40 

 Mechanical Properties 
 [Mechanical Properties] sample blank size (mm): 25 Tensile strength (σb / MPa): ≧ 980 Yield point (σs / MPa): ≧ 835 Elongation (δ5 /%): ≧ 12 section shrinkage ( ψ /%): ≧ 40 impact absorbed energy (Aku2 / J): ≧ 39 Brinell hardness (HBS100/3000) (annealing or tempering state): ≦ 217 


 Heat Treatment 
 Heat treatment: the first quenching temperature (℃): 920; coolant: water, a second quenching temperature (℃): - tempering heating temperature (℃): 450; coolant: water, oil