07Cr17Ni7Al (0Cr17Ni7Al) Stainless Steel Plate/Coil
07Cr17Ni7Al (0Cr17Ni7Al) Stainless Steel Plate/Coil - GB/T 4237 Data, Equivalents & Properties
In-depth technical data for 07Cr17Ni7Al (former 0Cr17Ni7Al) stainless steel plate and coil per GB/T 4237, covering chemical composition, mechanical and physical properties, complete international equivalents, similar materials, and application guidance.
Solution annealing, cold or hot forming, aging heat treatment, machining, welding (with appropriate consumables)
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07Cr17Ni7Al Stainless Steel Plate/Coil Introduction
07Cr17Ni7Al (designated as 0Cr17Ni7Al in older standards) is a semi-austenitic precipitation-hardening stainless steel. It offers an exceptional combination of high strength, good corrosion resistance, and excellent formability in the solution-annealed condition. After a simple low-temperature heat treatment (aging), the steel develops high tensile strength and hardness while maintaining adequate ductility.
- Key features: High strength-to-weight ratio, good fatigue resistance, and resistance to atmospheric and mildly aggressive chemical environments.
- Commonly supplied as hot-rolled plate or coil under GB/T 4237 in the solution-treated condition, ready for forming and subsequent precipitation hardening by the end user.
07Cr17Ni7Al Stainless Steel Plate/Coil Chemical Composition
The chemical composition of 07Cr17Ni7Al as specified in GB/T 4237-2015 and GB/T 20878-2007 for precipitation hardening stainless steel. The controlled addition of aluminium allows the formation of fine precipitates during aging, significantly increasing strength.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.09 | |
| Silicon (Si) | ≤1.00 | |
| Manganese (Mn) | ≤1.00 | |
| Phosphorus (P) | ≤0.040 | |
| Sulfur (S) | ≤0.030 | |
| Nickel (Ni) | 6.50 – 7.75 | Key austenite stabilizer |
| Chromium (Cr) | 16.00 – 18.00 | Provides corrosion resistance |
| Aluminium (Al) | 0.75 – 1.50 | Promotes precipitation hardening |
07Cr17Ni7Al Stainless Steel Plate/Coil Physical Properties
Physical properties of 07Cr17Ni7Al (17-7PH type) are representative for design calculations. Data are based on published technical literature and typical values for this precipitation hardening stainless steel grade. These values may vary slightly depending on heat treatment condition and product form.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.81 | g/cm³ | At 20°C |
| Modulus of elasticity (E) | 200 | GPa | At 20°C, solution annealed |
| Shear modulus (G) | 77 | GPa | At 20°C, calculated |
| Poisson's ratio (ν) | 0.30 | — | At 20°C |
| Thermal expansion coefficient (α) | 15.3 × 10⁻⁶ | K⁻¹ | 20°C to 100°C |
| Thermal expansion coefficient (α) | 16.1 × 10⁻⁶ | K⁻¹ | 20°C to 200°C |
| Thermal expansion coefficient (α) | 16.9 × 10⁻⁶ | K⁻¹ | 20°C to 300°C |
| Thermal expansion coefficient (α) | 17.6 × 10⁻⁶ | K⁻¹ | 20°C to 400°C |
| Thermal expansion coefficient (α) | 18.2 × 10⁻⁶ | K⁻¹ | 20°C to 500°C |
| Thermal conductivity (λ) | 14.0 | W/(m·K) | At 100°C |
| Thermal conductivity (λ) | 18.8 | W/(m·K) | At 500°C |
| Specific heat capacity (c) | 460 | J/(kg·K) | At 20°C |
| Electrical resistivity (ρ_e) | 0.80 | µΩ·m | At 20°C, typical |
07Cr17Ni7Al Stainless Steel Plate/Coil Mechanical Properties
The following mechanical properties are specified in GB/T 4237-2015 for 07Cr17Ni7Al plate/coil in the solution-annealed state (heat treatment at 1065±15°C, water quenching). These values represent the minimum or maximum requirements. Higher strength can be achieved after aging by the user (e.g., AT condition at 760°C+565°C or TH condition at 510°C). Testing is performed at room temperature.
| Property | Required Value | Unit | Test Conditions |
|---|---|---|---|
| 0.2% proof strength (Rp0.2) | ≤380 | MPa | Room temperature, as-solution-annealed |
| Tensile strength (Rm) | ≤1030 | MPa | Room temperature, as-solution-annealed |
| Elongation after fracture (A) | ≥20 | % | Gauge length 50 mm, as-solution-annealed |
| Hardness | ≤229 | HBW | As-solution-annealed |
07Cr17Ni7Al Stainless Steel Plate/Coil Complete Equivalent Material Standards and Designations
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| China | GB/T 4237-2015, GB/T 3280 | 07Cr17Ni7Al (0Cr17Ni7Al) | Original Chinese grade |
| USA | ASTM A693, AMS 5528 | Grade 631 (UNS S17700) | Widely known as 17-7PH |
| Japan | JIS G4304, JIS G4305 | SUS631 | Identical precipitation hardening type |
| EU | EN 10088-2, EN 10088-3 | X7CrNiAl17-7 (1.4568) | Harmonized European grade |
| International | ISO 15510 | X7CrNiAl17-7 | ISO designation matching EN |
07Cr17Ni7Al Stainless Steel Plate/Coil Application Introduction
07Cr17Ni7Al is ideally suited for parts that require high strength, good fatigue resistance, and moderate corrosion protection. The steel is easily formed in the soft, solution-annealed state and subsequently hardened through a simple heat treatment, allowing complex shapes to be fabricated cost-effectively.
- Typical processing route: solution annealing → cold/hot forming → cleaning → precipitation hardening (aging at 510°C or 760°C + 565°C depending on desired properties).
- Welding can be performed with matching or austenitic fillers, followed by re-solution treatment if necessary.
Product Applications: Hot-rolled plate and coil for structural components, Cold-rolled strip for stamping and fine blanking, Precision strip for high-performance springs and flexures, Forged blanks for machined parts
Processed into products: Flat springs, spiral springs, and constant-force springs, Belleville washers and disc springs, Metal diaphragms and bellows, Aircraft structural clips and brackets, Valve stems and seats, Flexible shafts and torsion bars, Fasteners (bolts, screws) for high-temperature, high-stress environments
Application industries: Aerospace and defense (airframe components, fasteners, clamps), Automotive (engine valves, springs, exhaust system hangers), Chemical and petrochemical equipment (valve parts, pump shafts, springs), General engineering (high-strength washers, diaphragms, flexible couplings, bellows), Medical instruments (orthodontic wires, surgical instruments)
07Cr17Ni7Al Stainless Steel Plate/Coil Closely Related or Similar Substitute Stainless Steels
| Country/Region | Standard | Designation | Remarks |
|---|---|---|---|
| China | GB/T 20878 | 07Cr15Ni7Mo2Al (0Cr15Ni7Mo2Al) | PH 15-7 Mo variant with molybdenum for slightly better corrosion resistance; similar precipitation hardening mechanism. |
| USA | ASTM A693 | Grade 632 (UNS S15700) | PH 15-7 Mo, a molybdenum-bearing analogue with enhanced strength and corrosion properties. |
| USA | ASTM A564, AMS 5643 | Type 630 (UNS S17400, 17-4PH) | Martensitic precipitation hardening stainless steel; higher strength after aging but different formability and corrosion resistance. |
| China/Global | GB/T 1220, ASTM A276 | 12Cr17Ni7 (S30100, SUS301) | Metastable austenitic stainless steel (301); can achieve high strength through cold working but is not a precipitation hardening grade, often considered in similar high-strength spring applications. |
Notes:
Important processing notes:
- Aging heat treatment must follow the recommended parameters; over-aging can reduce strength and corrosion resistance.
- For optimal performance, the surface should be free of oxide scale and contamination before aging.
- Solution annealing temperature control is critical—overheating may cause grain growth and loss of toughness.
- The steel is magnetic in the aged condition. In solution-annealed state it may be slightly magnetic due to martensite transformation during cooling.
- Contact a material supplier for certified mill test reports and specific processing recommendations for the intended application.
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