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 $ !
Order 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
Key Characteristics & Advantages
Excellent High-Temperature Strength: Retains a high percentage of its tensile and creep strength at temperatures ranging from -250°C to 700°C (-418°F to 1292°F), making it superior to standard stainless steels.
Outstanding Creep & Stress Rupture Resistance: Designed to withstand constant load and deformation under stress at high temperatures for extended periods.
Good Corrosion Resistance: Offers excellent resistance to oxidation and scaling, as well as good performance in various corrosive atmospheres, comparable to Type 304 stainless steel.
Precipitation Hardenable: The alloy is solution annealed and then aged to achieve its high strength levels, which cannot be attained through work hardening alone.
Common Specifications and Standards
Fasteners made from this alloy typically conform to the following standards:
ASTM A453 / A453M: Standard Specification for High-Temperature Bolting
ASME SA453: Equivalent ASME standard for pressure vessel applications.
AMS 5731: Aerospace Material Specification for bars, wires, and forgings.
AMS 5737: For fasteners specifically.
UNS S66286: Unified Numbering System designation.
Typical Chemical Composition (Weight %)
| Element | Content (%) |
|---|---|
| Iron (Fe) | Balance |
| Nickel (Ni) | 24.0 - 27.0 |
| Chromium (Cr) | 13.5 - 16.0 |
| Molybdenum (Mo) | 1.0 - 1.5 |
| Titanium (Ti) | 1.9 - 2.35 |
| Vanadium (V) | 0.10 - 0.50 |
| Boron (B) | 0.001 - 0.010 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
Mechanical Properties (Aged Condition - Representative Values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 1300 MPa (189 ksi) |
| Yield Strength (0.2% Offset) | ≥ 830 MPa (120 ksi) |
| Elongation | ≥ 15% |
| Hardness | Rockwell C 30 - 38 (Approx.) |
Primary Applications
This alloy is the material of choice for critical high-temperature bolting in demanding industries:
Aerospace: Jet engine components, turbine blades, casing bolts, afterburner parts.
Power Generation: Gas turbines, turbochargers, high-temperature bolting for steam turbines.
Automotive & Racing: High-performance turbo systems and exhaust components.
Nuclear Industry: Core components and instrumentation.
Summary
In essence, X6NiCrTiMoVB25-15-2 (A-286) fasteners are premium, high-performance components designed for the most challenging environments where failure is not an option. They provide an optimal balance of immense strength, long-term stability, and reliable corrosion resistance at extreme temperatures.
The stainless steel material used in 316/304 fasteners is highly resistant to corrosion, making it ideal for use in food and beverage processing applications, where hygiene and safety are critical. It is also resistant to extreme temperatures, which makes it suitable for use in high-temperature applications, such as cooking and sterilization.
| Physical Element | ASTM A193 grade B7 (AISI 4140) | ASTM A193 grade B8 (AISI 304) | ASTM A193 grade B8M (AISI 316) |
|---|---|---|---|
| Carbon | 0.38 - 0.48% | 0.08% max | 0.08% max |
| Manganese | 0.75 - 1.00% | 2.00% max | 2.00% max |
| Phosphorus, max | 0.035% | 0.045% | 0.045% |
| Sulfur, max | 0.040% | 0.030% | 0.030% |
| Silicon | 0.15 - 0.35% | 1.00% max | 1.00% max |
| Chromium | 0.80 - 1.10% | 18.0 - 20.0% | 16.0 - 18.0% |
| Nickel | absent | 8.0 - 11.0% | 10.0 - 14.0% |
| Molybdenum | 0.15 - 0.25% | absent | 2.00 - 3.00% |
| ASTM A193 | Size | Min Tensile Strength (KSI) | Min Yield Strength (KSI) | Min Elongation (%) | RA % min | Max HBW | Max HRC |
|---|---|---|---|---|---|---|---|
| ASTM A193 grade B7 | Up to 2-1/2 | 125 | 105 | 16 | 50 | 321 | 35 |
| 2-5/8 - 4 | 115 | 95 | 16 | 50 | |||
| 4-1/8 - 7 | 100 | 75 | 18 | 50 | |||
| ASTM A193 grade B8 Class 1 | All | 75 | 30 | 30 | 50 | 223 | 35 |
| ASTM A193 grade B8M Class 1 | All | 75 | 30 | 30 | 50 | 223 | 96 |
| ASTM A193 grade B8 Class 2 | Up to 3/4 | 125 | 100 | 12 | 35 | 321 | 35 |
| 7/8 - 1 | 115 | 80 | 15 | 35 | |||
| 1-1/8 - 1-1/4 | 105 | 65 | 20 | 35 | |||
| 1-3/8 - 1-1/2 | 100 | 50 | 28 | 45 | |||
| ASTM A193 grade B8M Class 2 | Up to 3/4 | 110 | 95 | 15 | 45 | 321 | 35 |
| 7/8 - 1 | 100 | 80 | 20 | 45 | |||
| 1-1/8 - 1-1/4 | 95 | 65 | 25 | 45 | |||
| 1-3/8 - 1-1/2 | 90 | 50 | 30 | 45 |
The material chosen for the threaded stud and the hex nuts should be compatible. Materials for bolting sets shall be selected based on the process's working temperatures, as shown in the table below:
| TEMPERATURE °C ( °F ) | ||
| STUD BOLTS MATERIALS | MIN. | MAX. |
| CARBON STEEL | -29 (-20) | 300 (572) |
| A193 B7, L7 | -73 (-100) | 400 (752) |
| A193 B6 | 0 (32) | 500 (932) |
| A193 B8 | -200 (-325) | 575 (1067) |
| A193 B16 | 0 (32) | 520 (968) |
| A193 B17B | -29 (-20) | 650 (1202) |
| A913 Inconel 718 | 0 (32) | 750 (1382) |
| A453 Gr. 660 | -29 (20) | 538 (1000) |
Why choose Qishine?
Who choose Qishine?
About Sample
){kind=link}