This article references authoritative data from the Metal Materials Encyclopedia and provides a detailed analysis of CrWMn performance characteristics and processing key points. CrWMn is a widely used low-alloy tool steel with advantages such as high hardenability, minimal quenching deformation, and good wear resistance. It is commonly used to manufacture gauges, gauge blocks, precision cold stamping dies, and similar tools.
1. CrWMn Basic Information
CrWMn is a low-alloy tool steel containing chromium, tungsten, and manganese (GB/T 1299-2014). Due to the presence of multiple carbide-forming elements, this steel exhibits fine and uniform carbides, minimal retained austenite after quenching, and low quenching deformation. Its main characteristics are good hardenability and high dimensional stability; however, strict temperature control is required during forging and heat treatment to prevent network carbides.
2. Chemical Composition (GB/T 1299-2014)
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.90-1.05 |
| Silicon (Si) | ≤0.40 |
| Manganese (Mn) | 0.80-1.10 |
| Chromium (Cr) | 0.90-1.20 |
| Tungsten (W) | 1.20-1.60 |
| Phosphorus (P) | ≤0.030 |
| Sulfur (S) | ≤0.030 |
3. Mechanical Properties
| Property | Value | Test Condition |
|---|---|---|
| Hardness (Annealed) | ≤255 HB | Isothermal annealing |
| Hardness (Quenched) | ≥62 HRC | Low-temperature tempering after quenching |
| Tensile Strength | Depends on heat treatment condition | — |
4. Heat Treatment Process
Heat treatment characteristics of CrWMn:
- Forging temperature: 1100-850°C (final forging temperature ≥850°C)
- Annealing process: Isothermal annealing at 770-790°C, furnace cool to below 550°C before removal
- Quenching temperature: 800-830°C
- Cooling medium: Oil cooling (water cooling strictly prohibited, prone to cracking)
- Tempering temperature: Low-temperature tempering at 150-250°C
- Hardness after quenching: 62-65 HRC
- Precautions: Adequate preheating is required during quenching heating to prevent deformation and cracking; slow cooling is required after forging to prevent network carbides
5. Typical Applications
- Precision gauges: High-precision measuring tools such as gauge blocks, plug gauges, and ring gauges
- Cold stamping dies: Precision cold stamping dies, drawing dies, bending dies
- Cutting tools: Taps, dies, reamers, broaches
- Wear-resistant parts: Precision wear-resistant guide pillars, guide bushings, rollers
6. CNC Machining Performance
CNC machining characteristics of CrWMn:
- Machining in annealed state: Moderate machinability; fine and uniform carbide particles provide high machined surface finish
- Machining after quenching: Requires grinding or hard turning with CBN tools
- Recommended tools: Carbide tools (annealed state), CBN tools (after quenching)
- Cutting speed: 60-100 m/min (annealed state)
- Coolant: Cutting oil or emulsion recommended
7. Purchasing Guide
Market price reference:
- Plate: 15-25 RMB/kg
- Bar: 18-28 RMB/kg
When purchasing, check the material certificate to confirm the chemical composition complies with the GB/T 1299 standard, and the annealed hardness should be within 255 HB.
8. Our Services
Dongguan Stirling Metal Products Co., Ltd. professionally provides CrWMn material + CNC machining One-Stop Service:
- ✅ Material procurement: genuine product guarantee, complete material certificates
- ✅ CNC machining: precision ±0.01mm, smooth surface finish
- ✅ Heat treatment: quenching, tempering, surface treatment
- ✅ Sample production: fast delivery in 3-5 days
- ✅ Batch production: 7-15 day delivery
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