15-7MoPH Stainless Steel Round Bar
Grade: 632/15-7MoPH/UNS S15700
Size:
Cold drawn: φ4mm-φ60mm
Hot Rolled: φ16mm-φ230mm
Forged: φ230mm-φ1200mm
Surface Finish: Black Annealed, Polished Bright, Centerless Grinding
Diameter Tolerance: H9, H11, h9, h11 etc
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- ISO 9001 Direct Factory
- Custom Cutting & Processing
- 100% MTC & SGS Inspection Supported
632 stainless steel, commonly known as 15-7MoPH stainless steel, is a precipitation-hardening semi-austenitic stainless steel grade designated as UNS S15700. It was developed to provide a combination of very high strength, excellent corrosion resistance, good toughness, and superior dimensional stability. The alloy is designed as an improved version of 17-7PH stainless steel, with increased molybdenum content to enhance mechanical properties and corrosion resistance.
The chemical composition of 15-7MoPH stainless steel includes approximately 15% chromium, 7% nickel, and 2–3% molybdenum, with aluminum additions for precipitation hardening. The alloy achieves high strength through a controlled heat treatment process involving solution treatment, conditioning, and aging. During aging, aluminum-rich precipitates form within the martensitic matrix, producing excellent tensile strength and fatigue resistance.
632 stainless steel bars have a semi-austenitic structure in the solution-treated condition and transform into martensite during conditioning treatment. After precipitation hardening, the material provides exceptional strength, good corrosion resistance, and excellent resistance to distortion. Compared with 17-7PH stainless steel, 15-7MoPH provides higher strength and improved resistance to general corrosion and stress corrosion cracking.
The alloy maintains good toughness and dimensional stability after heat treatment, making it suitable for precision components requiring tight tolerances. It also provides excellent spring properties and fatigue resistance under repeated loading conditions.
15-7MoPH stainless steel bars are widely used in aerospace components, aircraft structural parts, high-strength springs, diaphragms, valve components, pressure sensors, fasteners, chemical processing equipment, and precision mechanical components where high strength and corrosion resistance are required.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A564 / A564M – UNS S15700 | Wrought Precipitation-Hardening Stainless Steel Bars |
| ASTM | ASTM A693 – UNS S15700 | Precipitation-Hardening Stainless Steel Plate, Sheet and Strip |
| ASTM | ASTM A276 / A276M – UNS S15700 | Stainless Steel Bars and Shapes |
| UNS | S15700 | 15-7MoPH Stainless Steel Grade |
| JIS | JIS G4303 SUS632 | Stainless Steel Bars |
| EN | No direct equivalent | Precipitation Hardening Stainless Steel |
| DIN | DIN 1.4574 | X7CrNiMoAl15-7 Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Treatment + Conditioning + Aging |
| Solution Treatment Temperature | Approximately 950–970°C followed by rapid cooling |
| Conditioning Treatment | C or R Condition for Martensitic Transformation |
| Aging Conditions | RH950, TH1050, CH900 |
| Surface Condition | Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A564 / ASTM A276 |
| Inspection | Chemical Analysis, Mechanical Testing, Hardness Testing, Dimensional Inspection |
| Supply Condition | Solution Treated, Cold Worked, Age Hardened |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.09 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.040 |
| Chromium (Cr) | 14.00 – 16.00 |
| Nickel (Ni) | 6.50 – 7.75 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Aluminum (Al) | 0.75 – 1.50 |
| Iron (Fe) | Balance |
Mechanical Properties
Typical Aging Conditions
| Property | RH950 Condition | TH1050 Condition |
| Tensile Strength | ≥ 1520 MPa | ≥ 1070 MPa |
| Yield Strength (0.2% Offset) | ≥ 1410 MPa | ≥ 860 MPa |
| Elongation | ≥ 4% | ≥ 6% |
| Hardness | Approx. 45–50 HRC | Approx. 35–42 HRC |
| Condition | Age Hardened | Age Hardened |
| Industry | Applications |
| Aerospace Industry | Aircraft structural components, fasteners, landing gear parts |
| Spring Industry | High-strength springs, clips, retaining rings |
| Precision Engineering | Diaphragms, sensors, precision mechanisms |
| Oil & Gas Industry | High-strength corrosion-resistant components |
| Chemical Industry | Processing equipment components |
| Valve Industry | Valve springs and pressure-control parts |
| Mechanical Engineering | Shafts, tooling, high-strength fasteners |
632 stainless steel, commonly known as 15-7MoPH stainless steel, is a precipitation-hardening semi-austenitic stainless steel grade designated as UNS S15700. It was developed to provide a combination of very high strength, excellent corrosion resistance, good toughness, and superior dimensional stability. The alloy is designed as an improved version of 17-7PH stainless steel, with increased molybdenum content to enhance mechanical properties and corrosion resistance.
The chemical composition of 15-7MoPH stainless steel includes approximately 15% chromium, 7% nickel, and 2–3% molybdenum, with aluminum additions for precipitation hardening. The alloy achieves high strength through a controlled heat treatment process involving solution treatment, conditioning, and aging. During aging, aluminum-rich precipitates form within the martensitic matrix, producing excellent tensile strength and fatigue resistance.
632 stainless steel bars have a semi-austenitic structure in the solution-treated condition and transform into martensite during conditioning treatment. After precipitation hardening, the material provides exceptional strength, good corrosion resistance, and excellent resistance to distortion. Compared with 17-7PH stainless steel, 15-7MoPH provides higher strength and improved resistance to general corrosion and stress corrosion cracking.
The alloy maintains good toughness and dimensional stability after heat treatment, making it suitable for precision components requiring tight tolerances. It also provides excellent spring properties and fatigue resistance under repeated loading conditions.
15-7MoPH stainless steel bars are widely used in aerospace components, aircraft structural parts, high-strength springs, diaphragms, valve components, pressure sensors, fasteners, chemical processing equipment, and precision mechanical components where high strength and corrosion resistance are required.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A564 / A564M – UNS S15700 | Wrought Precipitation-Hardening Stainless Steel Bars |
| ASTM | ASTM A693 – UNS S15700 | Precipitation-Hardening Stainless Steel Plate, Sheet and Strip |
| ASTM | ASTM A276 / A276M – UNS S15700 | Stainless Steel Bars and Shapes |
| UNS | S15700 | 15-7MoPH Stainless Steel Grade |
| JIS | JIS G4303 SUS632 | Stainless Steel Bars |
| EN | No direct equivalent | Precipitation Hardening Stainless Steel |
| DIN | DIN 1.4574 | X7CrNiMoAl15-7 Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Treatment + Conditioning + Aging |
| Solution Treatment Temperature | Approximately 950–970°C followed by rapid cooling |
| Conditioning Treatment | C or R Condition for Martensitic Transformation |
| Aging Conditions | RH950, TH1050, CH900 |
| Surface Condition | Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A564 / ASTM A276 |
| Inspection | Chemical Analysis, Mechanical Testing, Hardness Testing, Dimensional Inspection |
| Supply Condition | Solution Treated, Cold Worked, Age Hardened |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.09 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.040 |
| Chromium (Cr) | 14.00 – 16.00 |
| Nickel (Ni) | 6.50 – 7.75 |
| Molybdenum (Mo) | 2.00 – 3.00 |
| Aluminum (Al) | 0.75 – 1.50 |
| Iron (Fe) | Balance |
Mechanical Properties
Typical Aging Conditions
| Property | RH950 Condition | TH1050 Condition |
| Tensile Strength | ≥ 1520 MPa | ≥ 1070 MPa |
| Yield Strength (0.2% Offset) | ≥ 1410 MPa | ≥ 860 MPa |
| Elongation | ≥ 4% | ≥ 6% |
| Hardness | Approx. 45–50 HRC | Approx. 35–42 HRC |
| Condition | Age Hardened | Age Hardened |
| Industry | Applications |
| Aerospace Industry | Aircraft structural components, fasteners, landing gear parts |
| Spring Industry | High-strength springs, clips, retaining rings |
| Precision Engineering | Diaphragms, sensors, precision mechanisms |
| Oil & Gas Industry | High-strength corrosion-resistant components |
| Chemical Industry | Processing equipment components |
| Valve Industry | Valve springs and pressure-control parts |
| Mechanical Engineering | Shafts, tooling, high-strength fasteners |
