OT718 tool steel-plastic mould steel

OT718 tool steel is a good quality plastic mould steel, normal forging make it for get high quality.  it is equivalent with GB 3Cr2NiMo, Din W-Nr 1.2738, AISI P20+Ni, JIS ISO 35CrNiMo2.

Otai Special Steel is OT718 steel china supplier and Wholesalers. supply in round bar, plate , flat bar, square. delivery condition can as customer require provide Annealing, Pre-Hardness(28-34HRc),  black surface or bright milled surface. If you have get a price of OT718 bar stock,  pls feel free contact us. email: jack@otaisteel.com

OT718 datenblatt Chemical composition as below:

ELEMENT C Si Mn Mo Cr Ni
 contents（%） 0.28~0.40 0.20~0.80 0.60~1.00 0.30~0.55 1.40~2.00 0.80~1.20

 

OT718 tool steel Application

OT718 steel Usage is same as the mold steel P20 type, but as a result of better hardenability, superior performance, can make size large, high-grade plastic mold forming parts

Add hard processing

For improve Injection mould life up to 800000 times more, can be implemented on pre hardened steel quenching and low temperature tempering and hard way to achieve. In 500-600 ℃ preheat before quenching when 2-4 hours, and then in 850-880 ℃ heat preservation time (at least 2 hours), into the oil cooled to 50-100 ℃ oil air cooling, hardness after quenching can reach 50 to 52 HRC, so as to prevent cracking should be 200 ℃ low temperature tempering processing, immediately after tempering hardness can keep more than 48 HRC .

Nitriding treatment

Nitriding treatment can get high hardness surface structure, surface hardness after nitriding of 650-700 hv
(57 to 60 HRC) die life can reach more than 1 million times, nitride layer with compact structure, smooth features, mould stripping and wet air and alkali corrosion resistance improved.

Quenching and tempering (Q+T)

Quenching temperature 840 ~ 870 ° C, tempering temperature 200 ~ 500 ° C, 50 to 55 HRC hardness

Material performance

  • Physical properties of OT718 Tool steel

(sample hardness 340 HBW, at room temperature and under high temperature)
1) temperature is 20 ° C / 200 ° C / 400 ° C, the density of 7. 8 g/cm / 7.75 g/cm / 7. 7 g/cm.
2) the temperature in the 20 ~ 200 ° C / 20 ~ 200 ° C, linear expansion coefficient of: 12.6 x 10 k / 13.5 x 10 k.
3) temperature is 20 ° C / 200 ° C / 400 ° C, thermal conductivity, 29.0 W (m, K), 29.5 W/(m, K) / 31.0 w. (m. K)
4) temperature is 20 ° C / 200 ° C / 400 ° C, modulus of elasticity: 205000 mpa / 200000 mpa / 185000 mpa

  • Mechanical properties of OT718 plastic mould steel
(sample hardness 340 HBW, room temperature and under high temperature)
1) temperature is 20 ° C / 200 ° C / 400 ° C, the tensile strength of 1100 mpa / 1050 mp8/850 mpa.
2) temperature is 20 ° C / 200 ° C / 400 ° C, the conditions to yield strength 980 mpa / 925 mpa / 770 mpa.
3) temperature is 20 ° C / 200 ° C / 400 ° C, reduction of 49% / 51% / 52%
4) temperature is 20 ° C / 200 ° C / 400 ° C, elongation is 13% / 14% / 16%
5) temperature is 20 ° C / 200 ° C / 400 ° C, impact toughness (or greater) 20 j/cm / 32 j/cm / 42 j/cm
  • Critical temperature
critical point Ac1 Ac3 Ar1 Ar3 Ms Mf
Temperature (approximation) / ℃ 770 825 640 755 335 180
  • Expansion coefficient
Temperature/℃ 18~100 18~200 18~300 18~400 18~500 18～600 18～700
Linear expansion coefficient of /C 11.9×10 12.20×10 12.50×10 12.81×10 13.11×10 13.41×10 13.71×10
  • Thermal conductivity
Temperature/℃ 20 100 200 300 400
Thermal conductivityλ/W·（m·K）-1 36.0 33.4 31.4 30.1 29.3

Grinding OT718 also can provided.

Contact us 

Tel: 0086-769-23190193
Fax: 0086-769-88705839
Email (English): jack@otaisteel.com
Email (Español): jack@otaisteel.com