30crmnti Introduction 
 Chemical composition 
 Mechanical Properties 
 Heat treatment specifications 
 30crmnti representation Material Name: Alloy structural steel grades: 30CrMnTi Standard: GB / T 3077-1988 
 30crmnti Introduction 
 ● Features and Scope: the strength of steel than 20CrMnTi, high hardenability, impact toughness, but slightly lower. Mainly used for carburizing steel, carburizing temperature directly after quenching, high bending strength, good wear resistance. In the quenching and tempering, or quenching and after use, cutting of medium. Tractor industry for the manufacture of heavy duty carburized parts larger cross-section and a larger force of the gears, gear shafts, worm and so on. 

 Chemical composition 
 ● Chemical Composition: 
 Carbon C: 0.24 ~ 0.32 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.80 ~ 1.10 S S: to allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 to allow the residual content of chromium Cr: 1.00 ~ 1.30 Ni: to allow the residual content ≤ 0.030 Copper Cu : to allow the residual titanium content ≤ 0.030 Ti: 0.04 ~ 0.10 
 Mechanical Properties 
 ● Mechanical Properties: Tensile σb (MPa): ≥ 1470 (150) Elongation δ5 (%): ≥ 9 Reduction of area ψ (%): ≥ 40 Impact energy Akv (J): ≥ 47 impact toughness αkv (J/cm2): ≥ 59 (6) Hardness: ≤ 229HB sample size: Sample 
 Heat treatment specifications 
 ● Heat treatment and microstructure specifications: Heat treatment specifications: quenching: the first 880 ℃, the second 850 ℃, oil-cooling; tempering 200 ℃, water, air-cooled. Microstructure: martensite. ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. 
 30crmnti representation 
 ① steel beginning of the two numbers indicate the carbon content of steel, the average carbon content of the very few that, as 40Cr, 25Cr2MoVA alloy steel pipe ② main alloying elements, in addition to individual micro-alloying elements, in general, to a few percent said. When the average alloy content of <1.5%, the steel elements are generally marked only symbols, not marked content, but prone to cause confusion in those special circumstances, after the element symbol can also be marked with the number "1", such as steel "12CrMoV" and "12Cr1MoV", the former chromium content of 0.4-0.6%, 0.9-1.2% for the latter, all the remaining ingredients the same. When the average content of alloying elements ≥ 1.5%, ≥ 2.5%, ≥ 3.5% ... ..., the symbol of the element content should be marked on the back, can be expressed as the corresponding 2,3,4 ... etc. For example 18Cr2Ni4WA. ③ steel vanadium V, Ti Ti, Al AL, boron B, RE alloys of rare earth elements are micro-alloying elements, although very low levels, should bid out in steel. For example 20MnVB steel. To 0.07-0.12% vanadium, boron 0.001-0.005%. ④ High quality steel in the steel should be added the last "A", as distinct from the general high quality steel. ⑤ special purpose alloy steel, steel, known (or suffix) on behalf of the steel uses symbols. For example Lo dedicated 30CrMnSi riveting steel, steel, said to ML30CrMnSi.