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Alloy Steel

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Alloy Steel

Alloy steel is a type of steel alloyed with several elements such as molybdenum, manganese, nickel, chromium, vanadium, silicon, and boron. These alloying elements are added to increase strength, hardness, wear resistance, and toughness. The amounts of alloying elements may vary between 1 and 50%.

15CrMo (F12, 1.7335)

14Cr1Mo (F11)

12Cr2Mo1 (F22, 1.7383)

30CrMo (A29, AISI 4130)

42CrMo(ASTM A29 AISI 4140)

40CrNiMo(ASTM A29,AISI 4340)

● 15CrMo (F12, 1.7335)

15CrMo steel pearlite organization heat-resistant steel, at high temperatures with high thermal strength (δb ≥ 440MPa) and oxidation resistance, and has a certain amount of hydrogen corrosion resistance.

Executive Standard: GB/T 3077-2015 Steel plate standard GB/T11251-2009

Chemical composition:

GradeHira fiderana
15CrMo0.12 ~ 0.180.40 ~ 0.700.17 ~ 0.370.80 ~ 1.100.40 ~ 0.55≤0.30_≤0.035≤0.035

Fananana mekanika

GradeHerin'ady (MPa)Yield point (MPa)Elongation (%)
15CrMo440 ~ 64029522

● 14Cr1Mo (F11)

14Cr1Mo A182 F11 has high thermal strength (δb≥440MPa) and oxidation resistance at high temperature, and has certain resistance to hydrogen corrosion.

It has good high temperature mechanical properties, high temperature oxidation resistance, corrosion resistance, good toughness, process performance and weldability, and is widely used in the manufacture of petrochemical, coal conversion, nuclear power, steam turbine cylinder blocks, thermal power, etc. Large equipment with complex media.

Chemique Composition

F11 Class10.05-0.150.30-0.60≤0.030≤0.0300.5-1.01.00-1.500.44-0.65
F11 Class20.10-0.200.30-0.80≤0.040≤0.040≤0.5-1.01.00-1.500.44-0.65
F11 Class30.10-0.200.30-0.80≤0.040≤0.0400.5-1.01.00-1.500.44-0.65

Tensile Properties

 Faharetana amin'ny sintonaTanjakaElongationRate of reduction in area:hamafin'ny
F11 Class1≥415MPa≥205MPa≥20≥45121-174
F11 Class2≥485≥275≥20≥30143-207
F11 Class3≥515≥310≥20≥30156-207
● 12Cr2Mo1 (F22, 1.7383)

12Cr2mo1 is made of chromium-molybdenum steel, which belongs to low-alloy steel forgings of chromium, molybdenum, iron and carbon.

The steel of this material has good heat resistance, corrosion resistance, weldability and toughness, can resist hydrogen corrosion, and also has good hardenability, and is currently used in a wide range of applications.

Chemique Composition

F22 Class10.05-0.150.30-0.60≤0.040≤0.040≤0.502.00-2.500.87-1.13
F22 Class30.10-0.150.30-0.60≤0.040≤0.040≤0.502.00-2.500.87-1.13

Tensile Properties

 Henjana (MPa)Ny herin'ny vokatra (MPa)ElongationRate of reduction in area:hamafin'ny
F11 Class1≥415≥205≥20≥35≤170
F11 Class3≥515≥310≥20≥30156-207
● 30CrMo (A29, AISI 4130)

30CrMo is a chromium molybdenum alloy steel, standard: GB/T 3077-1988

It has high strength and toughness, high hardenability and good thermal strength.

In the medium-sized machinery manufacturing industry, it is mainly used to manufacture quenched and tempered parts with large cross-sections that work under high stress conditions

Chemique Composition

30CrMo0.26 ~ 0.340.17 ~ 0.370.40 ~ 0.700.15 ~ 0.250.80 ~ 1.10≤0.035≤0.035≤0.030≤0.030

Tensile Properties

Faharetana amin'ny sintonaTanjakaElongationRate of reduction in area:hamafin'nyshock absorption energy
● 42CrMo(ASTM A29 AISI 4140)

42Cr2Mo steel is an ultra-high strength steel with high toughness, good hardenability, no significant tempering brittleness, small quenching deformation, high fatigue limit, resistance to multiple impacts after tempering, good low temperature impact toughness, high creep strength, and endurance strength at high temperatures. This steel usually uses quenching and tempering followed by surface hardening as a heat treatment option.

It is suitable for the manufacture of large and medium-sized plastic moulds that require certain strength and toughness.


Fenitra sinoaISO StandardCET Steel StandardJapan StandardGerman StandardAmerican Standard
GB / T 3077-199942CrMo442CrMo4SCM44042CrMo4 OR 1.72254140 OR G41400

Chemique Composition

42CrMo0.38 ~ 0.450.17 ~ 0.370.50 ~ 0.800.15 ~ 0.250.90 ~ 1.20≤0.035≤0.035≤0.030≤0.030

Tensile Properties

Faharetana amin'ny sintonaTanjakaElongationNy tahan'ny fihenan'ny faritrahamafin'nyshock absorption energy

● 40CrNiMo(ASTM A29,AISI 4340)

40CrNiMo steel has high strength, toughness and good hardenability and stability against overheating, but high sensitivity to white spots and tempering brittleness

Main uses: used to make high-strength parts such as aero-engine shafts, shafts, gears, fasteners, etc.

Executive Standard: GB/T 3077-1999 “Alloy Structural Steel”

Chemique Composition

40CrNiMo0.37 ~ 0.440.17 ~ 0.370.50 ~ 0.800.15 ~ 0.250.60 ~ 0.90≤0.025≤0.0251.25 ~ 1.65 ≤0.25

Tensile Properties

Faharetana amin'ny sintonaTanjakaElongationRate of reduction in area:Angovo misy fiantraikanyshock absorption energy