| Type: | Cold work tool steel |
|---|---|
| Standard: | AISI, ASTM, DIN, JIS |
| Composition: | Check Detailed Description |
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Cold work tool steel 9Mn2V/1.2842/O2 Hot Rolled/Forged Steel Flat Bar/Machined/Grinded /Steel Block
Ningshing Precision Machinery began in 1992. We devote oneself to providing One-Stop Solutions to our customers on Tool Steel, Die Steel, Alloy Steel, Mold Base, Machining Parts, CNC Machine.
Tool Steel | DIN 1.2842 | GB 9Mn2V| AISI O2
Chemical Composition(%)
| Steel Grade | C | Si | Mn | P | S | Cr | Mo | V |
| 1.2842 | 0.85-0.95 | 0.10-0.40 | 1.80-2.20 | ≤ 0.030 | ≤ 0.030 | 0.20-0.50 | ---- | 0.05-0.15 |
| O2 | 0.85-0.95 | ≤ 0.50 | 1.40-1.80 | ≤ 0.030 | ≤ 0.030 | ≤ 0.50 | ≤ 0.30 | ≤ 0.30 |
| 9Mn2V | 0.85-0.95 | ≤ 0.40 | 1.70-2.00 | ≤ 0.030 | ≤ 0.030 | ---- | ---- | 0.10-0.25 |
Characteristics
1. Cold work tool steel with high dimensional stability at heat treatment.
2. Very high cracking resistance. High machinability, medium thoughness and wear resistance.
Heat Treatment
Annealing
680 to 720°C
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C, further cooling in air. Hardness af ter annealing: Max. 220 HB.
Hardening
790 to 820°C
Oil, salt bath (200 to 250°C) up to 20 mm thickness. Holding time after temperature equalization: 15 to 30 minutes. Obtainable hardness: 63 - 65 HRC
Stress relieving
Approx. 650°C
Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After through heating, hold in neutral atmosphere for 1-2 hours.
Tempering
Slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air.For certain cases we recommend to reduce tempering temperature and increase holdingtime.
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| Steel Flat | Steel Plate | Die Steel |
| Plastic Mold Steel | Alloy Steel | Pre-machined Flat |
| Die Casting Die | Mold Base | Aluminum Die |
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