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Customized
ETERNAL
17-7 PH Chemical Specification
| C | Si | Mn | Cr | Al | Ni | P | S |
| ≤0.09% | ≤1% | ≤1% | 16-18% | 0.75-1.5% | 6.5-7.75% | ≤0.04% | ≤0.03% |
17-7PH Production Procedure
Application
Aerospace: aircraft structural components, fasteners, instrument panel parts.
Precision manufacturing: medical devices, watch components, electronic equipment casings.
Industrial field: high-pressure valves, springs, components in low-corrosion environments of chemicalequipment.
Feature
17-7PH stainless steel is a precipitation-hardened stainless steel, with its core advantage being its combination of high strength and excellent corrosion resistance, making it widely used in precision applications.
Composition characteristics: It contains 17% chromium and 7% nickel, and achieves precipitation hardening through elements such as copper and niobium.
Performance advantages: After heat treatment, the strength can reach 1379-1655MPa, far exceeding that of ordinary stainless steel; its corrosion resistance is close to that of 304 stainless steel, capable of withstanding atmospheric conditions, fresh water, and weak corrosive media.
Processing characteristics: Excellent cold workability, suitable for stamping and bending. Good dimensional stability after heat treatment, making it ideal for precision part processing.
Mechanical Property and Heat Treatment
Tensile strength
approximately 860-1030 MPa for TH1050 condition;
approximately 1380-1550 MPa for CH900 condition;
approximately 1170-1310 MPa for RH950 condition
Yield strength (0.2% yield)
approximately 690-860 MPa for TH1050 condition;
approximately 1240-1400 MPa for CH900 condition;
approximately 1030-1170 MPa for RH950 condition
Elongation (fracture)
≥15% for TH1050 state;
≥6% for CH900 state;
≥10% for RH950 state
Hardness (HRC)
TH1050 condition is approximately 26-32 HRC,;
CH900 condition is approximately 42-48 HRC;
RH950 condition is approximately 38-44 HRC
Heat Treatment Process
The core of heat treatment for 17-7 PH stainless steel is "solution treatment + precipitation hardening".Different heat treatment states (TH1050, CH900, RH950) correspond to different processes, ultimately determining its mechanical properties.
Core heat treatment process (general basic steps)
Solution treatment: First, heat the steel to 1000-1050℃ and maintain the temperature for 30-60 minutes.
Rapid cooling: Rapidly reduce the temperature through water quenching or air cooling to obtain a supersaturated austenite structure, preparing for subsequent hardening.
Precipitation hardening (key step): Holding at a specific temperature to promote the precipitation of fine precipitates from alloy elements (such as copper and niobium), thereby enhancing strength.
Specific heat treatment processes for different states
TH1050 condition (solution + stabilization): After solution treatment, cool to room temperature, then heat to 1050℃ and maintain for 30 minutes, followed by air cooling.
CH900 status (high-strength type): After solid solution cooling, heat to 900℃ and maintain for 1 hour, then air cool. Finally, maintain at 480℃ for 4 hours and then air cool.
RH950 status (balanced type): After solid solution cooling, heat to 950℃ and maintain for 1 hour, then air cool. After that, maintain at 510℃ for 4 hours and then air cool.
Delivery condition
1.Forged + annealing + black surface
2.Forged + annealing + polish
3.Forged + solution+aging + black surface
4.Forged + solution+aging + polish
Relevant equipment
2000 tons fast forging press production line
High temperature（upto1200℃）heating furnace
Heat treatment pool
Why Choose us?
1. More than 20 years machining experience
2. Rich experience on heat treatment , including normalizing , annealing ,quenching and tempering , high frequency surface hardening etc
3. Complete production equipment from raw material to finished products
4. Strict quality control , including raw material chemical specification test, non-destructive test , size inspection , hardness test etc .
5. More than 20 years exporting experience
6. Fast delivery time
