Plastic Injection Extrusion Modified 1.2738 Prehardened Cold Working Die Tool Mold Steel

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Jiangsu Longchangxing New Material Technology Co Ltd.

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ymts131r
Forged
AISI, JIS, ASTM, DIN, GB
Good Machinability
YMT
Wooden Pallet or Metal Frame-Work
According to customers
China
7224901000
Product Description
YMT S131R Pre-harden Steel
Similar steel grade for reference:
XPM, SF2000, LQ40, PAC5000, 718HH, 2738HH, P20HH, SW718H.TS, MFRx55








Plastic Steel
YMT S131R is a plastic mold steel, which has better hardenability than the commonly used 1.2738. The addition of elemental vanadium (V) increases the working hardness of the material and improves the resistance to tempering. YMT S131R means uniform hardness distribution with improved machinability, improved polishability, and is more suitable for texturing.
For better polishing results, ESR grade YMT S131R is recommended.

Chemical Composition (%)
Steel grade (%)CSiMnCrMoNiV
YMT S131R~0.28~MAX 0.30~1.50~1.50~0.50~1.10~0.15



Applications
Typical applications are for the manufacture of injection molds, especially for the manufacture of large plastic injection molds in different industrial sectors.









Hardness Range
YMT S131R:  36-41HRC / 1050-1220N/mm²

Physical Property
Modulus of Elasticity [103x N/mm2]: 205
Density[g/cm3]: 7.80
Specific Heat Capacity [J/Kg.K]: 460

Thermal Conductivity [W/m.K]:
20 °C100 °C200 °C300 °C400 °C500 °C600 °C700 °C
38.938.738.33939.838.937.932.6



Coefficient of Linear Thermal Expansion 10-6°C-1
20-100 °C20-200 °C20-300 °C20-400 °C20-500 °C20-600 °C20-270 °C
11.712.313.013.313.713.714.0



Stress Relief
To eliminate the stress caused by machining, the heating temperature must be about 650°C .
For pre-hardened materials, the relief stress of machining is eliminated by heating to approximately 550°C.

Forging Temperature: 1100-950 OC

Soft Annealing
Heated to 710-740 °C, slowly cooled with the furnace, annealing hardness max.235HB

Quenching
Heated to austenitizing temperature 860-880 °C, then quenched in oil, synthetic polymer quenching liquid or vacuum furnace, quenching hardness of about 52HRC.


Tempering/Hardness/UTS
Temp20 °C100 °C200 °C300 °C400 °C500 °C600 °C700 °C
HRC5251.550.549.547.5453825
N/mm21790176017001650155014401200850

Non-metallic Inclusion
As per ASTM E45 method A
At 1.5, Btl.5, Ctl.5, Dtl.5; Ad1,5, Bdl.5, Cd1.5, Ddl.5 or DIN50602 or subject to customer's
requirements.
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