CA6-NM Stainless Steel Round Bar (ASTM A743 / A743M)
CA6-NM Stainless Steel Round Bar is a martensitic stainless steel with nickel and molybdenum additions, offering an excellent balance of high strength, good toughness, and moderate corrosion resistance. It is widely used in hydro turbines, pump components, valve parts, and pressure-containing equipment, especially where strength and impact resistance are critical.
Key Features
- High strength with good toughness
- Better weldability than conventional martensitic stainless steels
- Good corrosion resistance in fresh water and mild industrial environments
- Excellent resistance to cavitation and erosion
- Suitable for heavy-duty structural and rotating components
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM Cast | CA6-NM |
| UNS | J91540 |
| EN | X3CrNiMo13-4 (similar) |
| AISI (Comparable) | 13-4 martensitic SS |
Sizes
| Diameter Range | Length |
|---|---|
| 20 mm – 500 mm | Up to 6 m |
| Custom Sizes | As per drawing & requirement |
CA6-NM Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.06 |
| Chromium (Cr) | 12.0 – 14.0 |
| Nickel (Ni) | 3.5 – 4.5 |
| Molybdenum (Mo) | 0.4 – 1.0 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
ASTM A743 / A743M CA6-NM Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 760 – 860 MPa |
| Yield Strength | ≥ 550 MPa |
| Elongation | ≥ 15% |
| Impact Toughness | Good at room temperature |
| Hardness | ~250 HB |
CA6-NM Round Bar Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | ~1450°C |
| Thermal Conductivity | ~25 W/m·K |
| Modulus of Elasticity | ~200 GPa |
Types of CA6-NM Round Bar
- Hot Rolled CA6-NM Round Bar
- Forged CA6-NM Round Bar
- Machined / Turned CA6-NM Round Bar
- Heat Treated CA6-NM Round Bar
Applications
- Hydraulic turbine shafts and runners
- Pump casings and impellers
- Valve bodies and valve stems
- Power plant and hydroelectric components
- Marine and water-handling equipment
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