1. Characteristics and scope of application

1.2344 is a pressure resistant hot work die steel. The steel is remelted by electroslag, uniform in material, good in hardenability, excellent in machinability and polishing performance, high toughness and plasticity, good high and low temperature wear resistance, and high temperature fatigue and heat resistance.

characteristic:

1. Uniform material, superior machinability and polishing

2. High toughness and high plasticity

3. High wear resistance at high and low temperatures

4. Excellent overall hardenability

5. Good high temperature strength and thermal fatigue resistance

6. Very low deformability during heat treatment

7. It has better isotropic properties than traditional steel, and has excellent toughness and plasticity in all directions. 1.2344 is pressure resistant hot work die steel.

Scope of application:

1. Die-casting mold (mould, fixing, upper mold, nozzle, nitriding thimble)

2. Extrusion die (mold, support, choke)

3. Hot pressing mold, (aluminum, magnesium, copper alloy)

4. Parts, such as cold shear, flash, hot shear, wear parts

 

2, chemical composition

C: 0.37-0.42;

Si: 0.9-1.20;

Mn: 0.30-0.50;

P≤0.030;

S ≤ 0.030;

Cr: 4.80-5.50;

Mo: 1.20-1.50;

V: 0.90-1.10;

 

3, physical properties and application status

Physical properties:

1) Density: 7.31g/cm

2) Linear expansion coefficient: temperature 18 ~ 100 ° C / 18 ~ 200 ° C / 18 ~ 300 ° C / 18 ~ 400 ° C / 18 ~ 500 ° C / 18 ~ 600 ° C / 18 ~ 700 ° C, coefficient of linear expansion 11.9 ×10K/12.20 ×10K/12. 50×10K/12. 81 ×10K/13.11 ×10K/13.41×10K/13.71×10K

3) Modulus of elasticity: (20 ° C) 212000MPa, shear modulus (room temperature) is 825000MPa, Poisson ratio 0.288

4) Thermal conductivity: Temperature 20 °C / 100 °C / 200 °C / 300 °C / 400 °C, thermal conductivity 36.0 [W / (m · K)] / 33.4 [W / (m · K)] / 31.4[W/ (m·K)]/30.1[W/ ​​(m·K)]/29.3[W/ (m·K)]

Application status:

30-56HRC

Status: Flat steel for plastic molds YB/T 094-1997 Specification: Flat steel width 170 ~ 410mm, thickness 25 ~ 105mm. Available in 29. 5 ~ 35HRC hardness. Pre-hard state, hardness ≤28HRC; annealed state, hardness ≤22HRC

 

4, heat treatment

Forging 1050-850 ° C

Softening annealing 820-840°C

Hardened 1020-1050 ° C

Tempering 520-700°C

Purity: according to ASTM E45 Method A, A sulfide ≤ 0.5, B oxide, C silicate and D spheroidal oxide each ≤ 1 or DIN 50602-K1 ≤ 10 or according to customer requirements.

Steel delivery status:

Soft annealing, good microstructure, hardness up to 229HB or quenching to customer requirements.

Isothermal annealing specification:

Annealing temperature (850±10) °C, heat preservation for 2h, with furnace cooling to (720±10) °C, heat preservation for 4h, furnace cooling to below 500 °C, air cooling, hardness ≤ 229HBW.

High temperature tempering specification:

Tempering temperature (730 ± 10) °C, heat preservation 2h, furnace cooling full ≤ 500 ° C, air cooling.

Quenching and tempering specifications:

Quenching temperature 850 ~ 880 ° C, oil cooling, hardness 50 ~ 52HRC; tempering temperature 580 ~ 640 ° C, air cooling, hardness 28 ~ 36HRC.

Pre-hardening treatment specification:

Heating temperature 860 ~ 900 ° C, oil cooling, tempering temperature 570 ~ 70O ° C, air cooling, tempering hardness 28 ~ 35HRC.

 

5, the corresponding brand

Corresponding Japanese brand: SKD61

Corresponding to the US brand: H13

Corresponding British brand: BH13