STS is an escrow service that protects both buyers and suppliers. Funds are held securely by Made-in-China.com until order terms (e.g., delivery, quality) are fulfilled
|
Still deciding? Get samples of $ !
Request Sample
|
| Customization: | Available |
|---|---|
| Material: | Stainless Steel |
| Type: | Round Head |
| Shipping Cost: | Contact the supplier about freight and estimated delivery time. |
|---|
Payment Guarantee
Platform-protected payments with refund support for eligible order issues.
Platform Logistics
Inspection Service
After-Sales & Dispute Handling
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
XIAMEN QISHINE
Xiamen Qishine Industry Co., Ltd. is a Chinese company established in 2013. We are a leading fabrication services provider in industries such as Oil & Gas, Petroleum, Marine, Oilfield, Mining, and Heavy Industry, specifically for pipeline construction and maintenance.
Qishine is ideal choice for EPC companies and project contractors. Our company specializes in supplying a range of products including Fasteners, Flanges, Gaskets, Fittings, Valves, Pipes and Piping Spare Parts. Our products are API, CE, TUV and ISO certified. Products are widely used on oil rigs, new nuclear power plant, Chemical and Heavy Industry.
Qishine is proud as being a premium product supplier who works closely with our clients to achieve the best possible results. We have an experienced team, skilled labor force, and advanced facilities to ensure safe and efficient project completion, meeting deadlines and budget requirements.
Qishine is ideal choice for EPC companies and project contractors.
ASTM A453 Gr.660 (also known as Alloy 660 or A-286) is a precipitation-hardening austenitic stainless steel offering outstanding high-temperature performance and corrosion resistance. Below is the detailed chemical composition and mechanical-property information:
Chemical composition of ASTM A453 Gr.660
| alloy | % | Ni | Cr | C | Mo | Mn | Si | S | P | Ti | V | B | Al |
| 660 | Min | 24 | 13.5 | - | 1 | - | - | - | - | 1.9 | 0.10 | 0.001 | - |
| Max | 27 | 16 | 0.08 | 1.5 | 2.0 | 1.0 | 0.03 | 0.04 | 2.35 | 0.50 | 0.01 | 0.35 |
Mechanical properties
| Class | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Reduction of area (%) | Hardness (HBW) |
| A, B, C | ≥895 | ≥585 | ≥15 | ≥18 | 248-321 |
| D (d ≤ 63.5 mm) | ≥895 | ≥725 | ≥15 | ≥18 | 248-321 |
| D (d > 63.5 mm) | ≥825 | ≥655 | ≥15 | ≥18 | 248-321 |
Heat treatment
- Solution treatment: 900 ± 14 °C, hold ≥ 2 h, oil quench.
- Age hardening: 720 ± 14 °C, hold ≥ 16 h, air cool.
Applications
ASTM A453 Gr.660 is widely used for high-temperature fasteners such as bolts, studs and nuts in gas turbines, PWR nuclear plants, petrochemical pressure vessels, and aero-engine structural joints.
Summary
ASTM A453 Gr.660 is a high-performance precipitation-hardening stainless steel that combines high strength at elevated temperature with excellent corrosion resistance, making it an ideal choice for critical fasteners in severe service.
In which environments are the fasteners of ASTM A453 Gr. 660 applicable?
- High temperature & high pressure: gas turbines, nuclear and steam-turbine plants, chemical reactors, etc. Continuous service up to ~700 °C with outstanding oxidation resistance.
- Cryogenic conditions: retains toughness and strength at -196 °C and below; suitable for LNG equipment and other low-temperature systems.
- Corrosive media: highly resistant to oxidation, stress-corrosion cracking and corrosion fatigue; performs well in marine, chemical and oil-&-gas environments.
Are there any cheaper alternative materials available?
Although Gr.660 offers premium performance, its price is high. For less extreme duties the following cost-effective substitutes may be considered:
| Alternative | Characteristics | Suitable environment | Relative cost |
| 316L stainless | Good corrosion resistance, lower high-temperature strength than 660 | Medium/low temperature, corrosive (chemical, food, marine) | Much lower |
| 17-4 PH (630) | Hardenable by heat treatment, moderate strength | Medium temperature, mildly corrosive | Medium |
| B8 stainless (ASTM A193 B8) | Conventional high-temperature bolting grade | ≤600 °C, pressure vessels, valves | Lower than 660 |
| PTFE-coated alloy steel | Carbon or low-alloy steel substrate with fluoropolymer coating | Low/medium temperature, corrosive, non-oxidising | Significantly lower; good for structural fasteners |
Recommendations
- For service >700 °C, highly corrosive media, or cryogenic conditions, Gr.660 remains the irreplaceable first choice.
- For temperatures below ~600 °C or moderate corrosion, consider 316L, 17-4 PH or B8.
- When tight cost control is required and the environment is corrosive but not high-temperature, PTFE-coated fasteners offer an economical solution.
If you can provide the specific operating temperature, pressure and medium, we can help you evaluate the most appropriate alternative material.
Product Recommendation
){kind=link}