Category Archives: Alloy Steel

34CrMo4 alloy structural steel

34CrMo4 steel is a kind of alloy structural steel. It has high rupture strength and creep strength at high temperature, good impact toughness at low temperature, good hardenability, no tendency to overheat, small quenching deformation, fair plasticity and medium machinability when cold forming. Poor weldability, preheating before welding, post welding heat treatment and stress relief are generally used after quenching and tempering treatment, and can also be used after high and medium frequency surface quenching or quenching and low and medium temperature tempering.

34CrMo4 steel equivalent grade:

34CrMo4 mechanical properties:

Tensile strength σ B (MPA): ≥ 985 (100)
Yield strength σ s (MPA): ≥ 835 (85)
Elongation δ 5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness value α kV (J / cm2): ≥ 78 (8)
Hardness: ≤ 229HB

18NiCrMo5 construction steel

18NiCrMo5 steel is a leading construction steel in circulation.
It is a type of steel supplied in the delivery condition “annealed”.

18NiCrMo5  equivalent steel grades:

Mechanical Properties:

Tensile Strength: ≥900

Yield Strength: ≥635

Elongation  (%): ≥10

Impact Value Kv (J): ≥35

Hardness (HB): ≥271

14NiCr14 carburizing steel

14NiCr14 is a widely used high-grade carburizing steel, which has high strength, ductility and hardenability as compared with 15Cr and 20Cr steels. Quenching and tempering at low temperature or high temperature tempering, have good mechanical properties, low temperature impact toughness, notch sensitivity, machinability and weldability is good, but the temper brittleness, white point of high sensitivity After carburizing are required for secondary quenching, special circumstances also need cold treatment.

14NiCr14 Equivalent Materials:

Mechanical properties:

Tensile strength σb (MPa): ≥930 (95)
Yield strength σs (MPa): ≥ 685 (70)
Elongation δ5 (%): ≥11
Section shrinkage ψ (%): ≥50
Impact energy Akv (J): ≥71
Impact toughness value αkv (J / cm2): ≥88 (9)

1.5217 alloy steel

1.5217 belongs to alloy steel, which is a DIN standard steel grade.

1.5217 equivalent steel grades

1.5217 Mechanical Properties

34CrNiMo6 Alloy steel

34CrNiMo6 steel can be induction hardened and it is weldable under certain conditions. Through hardenability to approch 100 mm diameter bar with oil quenching.

34CrNiMo6 steel  equivalent grades:

34CrNiMo6 steel  mechanical properties:

Hardness:36～40HRC
Tensile strength:1100 MPa
Elongation A:12%,
Impact toughness:8kg/cm2

25CrMo4 Alloy steel

25CrMo4 steel has high hardenability, no temper brittleness, good weldability, little tendency of cold cracking, good machinability and cold strain plasticity. It is generally used in the state of quenching and tempering or carburizing and quenching.

25CrMo4 equivalent grade

25CrMo4 steel machanical properties

Tensile strength σ B (MPA): ≥ 885 (90)
Yield strength σ s (MPA): ≥ 685 (70)
Elongation δ 5 (%): ≥ 12
Reduction of area ψ (%): ≥ 50
Impact energy Akv (J): ≥ 35
Impact toughness value α kV (J / cm2): ≥ 98 (10)
Hardness: ≤ 212hb

20NiCr14 Alloy Steel

20NiCr14 steel has good hardenability and uniform strength in a large cross-section. After quenching and tempering, it has good comprehensive mechanical properties. Good machinability, moderate cold deformation plasticity and weldability. It has the sensitivity of forming white spots and the tendency of temper brittleness in high temperature tempering.

20NiCr14 equivalent grade

20NiCr14 steel machanical properties

Tensile strength σ B (MPA): ≥ 980
Conditional yield strength σ 0.2 (MPA): ≥ 835
Elongation δ 5 (%): ≥ 10
Reduction of area ψ (%): ≥ 55
Impact toughness value α Ku (J / cm2): ≥ 98
Hardness: 341 ～ 292hb

25Cr2MoV Alloy steel

25Cr2MoV has excellent corrosion resistance and cold working stamping performance, strong corrosion resistance to oxidizing acids (such as nitric acid), alkali solution and most organic and inorganic acids.

25Cr2MoV equivalent grade

GB3077-88

25Cr2MoV steel machanical properties

Tensile strength σ B (MPA): ≧1090

Yield strength σ s (MPA): ≧1042

Elongation δ 5 (%): ≧18

Reduction of area ψ (%): ≧63

Impact toughness value α Ku (J / cm2):≧ 213

17CrNiMo6/1.6587 Alloy Steel

is is a heat treatable, low alloy steel containing nickel, chromium and molybdenum as per DIN Germany standard which is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength.

17CrNiMo6 equivalent grade

Tensile strength：650 – 880MPa

Yield strength：350 – 550MPa

Elongation：8 – 25%

Fatigue：275 – 275MPa

20CrMnSi Alloy steel

20CrMnSi  has high strength and toughness, high plasticity in cold deformation and good stamping performance. It is suitable for cold drawing, cold rolling and other cold working processes. It has good weldability, low hardenability and high temper brittleness, so it is not used for carburizing or other heat treatment. If necessary, 20CrMnSi steel can also be used after quenching and tempering.  It is generally not suitable for carburizing or other heat treatment except in some cases.

20CrMnSi equivalent grade

20CrMnSi  properties

Tensile strength σ B (MPA): ≥ 785 (80)
Yield strength σ s (MPA): ≥ 635 (65)
Elongation δ 5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 55
Impact toughness value α kV (J / cm2): ≥ 69 (7)
Brinell hardness (hbs100 / 3000) (annealed or tempered at high temperature): ≤ 207

39NiCrMo3 Alloy steel

39NiCrMo3  steel has high strength, toughness, good hardenability and stability against overheating, but it has high white point sensitivity and temper brittleness. Weldability is poor, high temperature preheating is required before welding, stress relief after welding, and use after quenching and tempering.

39NiCrMo3 equivalent grade

39NiCrMo3 mechanical properties

Tensile strength (MPa)≥980,
ElongationA (%) ≥12,
Reduction of area ≥55,
Impact energy Akv (J)≥78

Thousand tons 30CrNiMo8 stocking

30CrNiMo8 steel is German DIN standard in Q+T (quenched and tempered steel), equivalent to 30cr2ni2mo in China.

30crnimo8 material has high yield strength, tensile strength and fatigue strength, and sufficient plasticity and toughness.

Generally, EAF and BOF are used for smelting, and secondary refining, electroslag remelting or vacuum treatment, vacuum induction furnace smelting or double vacuum smelting and appropriate heat treatment are adopted for those with high requirements.

The material 30CrNiMo8 is difficult to machine. 30CrNiMo8 to achieve hrb80 below is very difficult, generally do about hrb85 can.

 30crnimo8 equivalent grade

30crnimo8 steel properties

30CrNiMo8 steel belongs to DIN alloy structure tempered steel, which has high yield strength, tensile strength, and enough plasticity and toughness. The critical temperature of Ac3 in 30crnimo8 heat treatment is 800℃, and the quenching temperature is Ac3+(30 ~ 70)℃. After comprehensive consideration, the process was determined as follows: normalizing 880℃, holding heat for 5h; The quenching temperature is 840 ~ 860℃, and the holding time is 4 ~ 4.5h. Water quenching oil is used for quenching and tempering temperature is 570 ~ 620℃. The tempering time should not only ensure that the tissue transformation can be fully carried out through through burning, but also try to eliminate the residual stress.