Good translation of the Metal Products (Shanghai) alloy structural steel companies (domestic alloy structural steel / alloy structural steel imports) 25mntibre alloy structural steel / 25mntibre steel plate / 25mntibre steel bars / 25mntibre coil / 25mntibre strip / 25mntibre steel pipe / 25mntibre wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 25MnTiBRE, alloy structural steel. Unified digital code: A74252 
 Chemical composition (mass fraction) (%) 
 C: 0.22 ~ 0.28 
 Si: 0.20 ~ 0.45 
 Mn: 1.30 ~ 1.60 
 B: 0.0005 ~ 0.0035 
 Ti: 0.04 ~ 0.10 
 Mechanical Properties]. 
 Sample blank size (mm): Sample 
 Heat treatment: 
 First quenching temperature (° C): 860; coolant: Oil 
 Second quenching temperature (℃): - 
 Tempering the heating temperature (° C): 200; coolant: water, air 
 Tensile strength (σb / MPa): ≧ 1380 
 Yield point (σs / MPa): - 
 ≧ 10 the Elongation (δ5 /%): 
 Section shrinkage rate (ψ /%): ≧ 40 
 Absorbed energy (Aku2 / J): ≧ 47 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 229 
 The main characteristics of 
 The mechanical properties of this steel than 20CrMnTi steel, also has good process performance. Hardenability of the steel is better, the critical hardenability diameter 17 ~ 27mm in oil; hot and cold, good processing properties and a wide forging temperature, oxidation leather loose, easy to clean. After normalizing to obtain more uniform distribution of pearlite and ferrite microstructure, the cutting performance of a good flat after carburizing carbon copies of the distribution of normal surface microstructure after quenching. RE addition, low temperature impact toughness increased, decreased notch sensitivity. The disadvantage of this steel is: manufacturing gear heat treatment distortion is generally slightly larger than the chrome steel gears. 
 [Application Examples] 
 Mainly used instead of the 20CrMnTi, 20CrMo steel under moderate load tractor carburized gear and outperforms 20CrMnTi steel. 
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