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ASME B18.31.2 All Thread Bar
QS Fastener: ASME B18.31.2 All Thread Bar
Name: ASME B18.31.2 All Thread Bar
Length: 3 meter long
Thread: 8 UN
Material: ASTM A193 B7
Size: 1-1/2 Inch
Manufacture Standard: ASME B18.31.2
Application: For Equipment Connection
Anti Corrosion Coating: Yellow Zinc
Length: 3 meter long
Thread: 8 UN
Material: ASTM A193 B7
Size: 1-1/2 Inch
Manufacture Standard: ASME B18.31.2
Application: For Equipment Connection
Anti Corrosion Coating: Yellow Zinc
Quantity
ASME B18.31.2 All Thread Bar is manufactured from high-quality 42CrMo (AISI 4140) alloy steel, strictly complying with ASME B18.31.2 standards. Standard specifications include a 1-1/2-inch diameter, 3-meter length, and 8 UN fine threads, delivering exceptional tensile strength and precision connection performance. The ASME B18.31.2 All Thread Bar features a yellow zinc-plated anti-corrosion coating, providing superior resistance to corrosion, making it particularly suitable for high-temperature, high-pressure fastening applications in industries such as petrochemical, power generation, and heavy machinery.
In-Depth Analysis of the High-Temperature Performance of ASME B18.31.2 All Thread Bar
ASME B18.31.2 All Thread Bar is widely used in high-pressure environments up to 450℃ due to its excellent high-temperature resistance. Its thermal stability stems from the optimized chemical composition of 42CrMo alloy steel and quenching & tempering heat treatment, ensuring high mechanical strength even under prolonged high-temperature service. Below is a multi-dimensional analysis of its high-temperature performance.
ASME B18.31.2 All Thread Bar is widely used in high-pressure environments up to 450℃ due to its excellent high-temperature resistance. Its thermal stability stems from the optimized chemical composition of 42CrMo alloy steel and quenching & tempering heat treatment, ensuring high mechanical strength even under prolonged high-temperature service. Below is a multi-dimensional analysis of its high-temperature performance.
1. Operating Temperature Range & Long-Term Service Capability
The ASME B18.31.2 All Thread Bar (ASTM A193 B7 standard) operates effectively within -100℃ to 450℃, with key performance indicators including:
- Low-temperature toughness: After tempering, the ASME B18.31.2 All Thread Bar retains excellent impact toughness (Charpy V-notch impact energy ≥27J) even at -100℃, preventing brittle fracture risks.
The ASME B18.31.2 All Thread Bar (ASTM A193 B7 standard) operates effectively within -100℃ to 450℃, with key performance indicators including:
- Low-temperature toughness: After tempering, the ASME B18.31.2 All Thread Bar retains excellent impact toughness (Charpy V-notch impact energy ≥27J) even at -100℃, preventing brittle fracture risks.
- High-temperature stability: At 450℃ under prolonged service, its tempered sorbite microstructure resists softening, ensuring no significant loss in tensile strength.
2. Short-Term High-Temperature Resistance (≤400℃)
Under sudden short-term high-temperature conditions (e.g., overheating or thermal shock), All Thread Bar demonstrates superior performance:
- Tensile strength retention >80% (vs. room temperature strength), maintaining ≥690 MPa at 400℃ (room temperature strength ≥860 MPa).
- This is due to molybdenum (Mo) solid-solution strengthening, inhibiting carbide aggregation and delaying strength loss.
Under sudden short-term high-temperature conditions (e.g., overheating or thermal shock), All Thread Bar demonstrates superior performance:
- Tensile strength retention >80% (vs. room temperature strength), maintaining ≥690 MPa at 400℃ (room temperature strength ≥860 MPa).
- This is due to molybdenum (Mo) solid-solution strengthening, inhibiting carbide aggregation and delaying strength loss.
3. Creep Rupture Strength (Long-Term High-Temperature Load Capacity)
The creep rupture strength of All Thread Bar is a critical measure of its long-term high-temperature durability. Key data includes:
- @370℃: Rupture strength ≥200 MPa under 100,000 hours (~11.4 years) of continuous load.
- @454℃: Under the same duration, rupture strength ≥120 MPa.
The creep rupture strength of All Thread Bar is a critical measure of its long-term high-temperature durability. Key data includes:
- @370℃: Rupture strength ≥200 MPa under 100,000 hours (~11.4 years) of continuous load.
- @454℃: Under the same duration, rupture strength ≥120 MPa.
This means:
- At 370℃, ASME B18.31.2 All Thread Bar safely withstands 200 MPa static stress (e.g., flange sealing preload) without creep rupture.
- At 454℃ (near its temperature limit), its load-bearing capacity remains significantly higher than standard carbon steel bolts (e.g., ASTM A307).
- At 370℃, ASME B18.31.2 All Thread Bar safely withstands 200 MPa static stress (e.g., flange sealing preload) without creep rupture.
- At 454℃ (near its temperature limit), its load-bearing capacity remains significantly higher than standard carbon steel bolts (e.g., ASTM A307).
4. Microstructural Mechanisms of High-Temperature Performance
The All Thread Bar's thermal stability is linked to the following microstructural properties:
1) Alloying Elements:
- Chromium (Cr): Enhances oxidation resistance, reducing high-temperature scale formation.
- Molybdenum (Mo): Inhibits dislocation movement, improving creep resistance.
The All Thread Bar's thermal stability is linked to the following microstructural properties:
1) Alloying Elements:
- Chromium (Cr): Enhances oxidation resistance, reducing high-temperature scale formation.
- Molybdenum (Mo): Inhibits dislocation movement, improving creep resistance.
2) Heat Treatment Process:
- Tempering temperature (580-650℃) exceeds service temperature, ensuring microstructure stability.
- Retained austenite <5%, avoiding high-temperature phase embrittlement.
- Tempering temperature (580-650℃) exceeds service temperature, ensuring microstructure stability.
- Retained austenite <5%, avoiding high-temperature phase embrittlement.
5. Engineering Application Guidelines
Despite its excellent high-temperature performance, the following considerations apply:
- Temperature Limit: Prolonged exposure >450℃ may cause carbide coarsening; switch to ASTM A193 B16 (CrMoV steel) for higher temperatures.
- Preload Management: Thermal expansion may cause relaxation—use flexible graphite gaskets and periodic inspections.
- Corrosion Protection: In H₂S or acidic environments, opt for B7M grade (HRC≤22) to prevent SCC (Stress Corrosion Cracking).
Despite its excellent high-temperature performance, the following considerations apply:
- Temperature Limit: Prolonged exposure >450℃ may cause carbide coarsening; switch to ASTM A193 B16 (CrMoV steel) for higher temperatures.
- Preload Management: Thermal expansion may cause relaxation—use flexible graphite gaskets and periodic inspections.
- Corrosion Protection: In H₂S or acidic environments, opt for B7M grade (HRC≤22) to prevent SCC (Stress Corrosion Cracking).
6. Comparison with Other High-Temperature Fastener Materials
| Material Standard | Max. Service Temp. | 370℃ Creep Strength (100,000h) | Typical Applications |
| ASTM A193 B7 | 450℃ | ≥200 MPa | Refineries, general high-temperature equipment |
| ASTM A193 B16 | 550℃ | ≥250 MPa | Ultra-high-pressure boilers, turbines |
| ASTM A453 660 | 600℃ | ≥300 MPa | Nuclear reactor bolts, aerospace components |
Conclusion
The ASME B18.31.2 All Thread Bar delivers outstanding high-temperature strength retention and creep resistance within -100℃ to 450℃, making it an ideal choice for petrochemical, power generation, and industrial fastening. For higher temperatures or corrosive environments, upgrading to B16 or nickel-based alloys is recommended. Proper selection and installation maximize the ASME B18.31.2 All Thread Bar's performance advantages.
The ASME B18.31.2 All Thread Bar delivers outstanding high-temperature strength retention and creep resistance within -100℃ to 450℃, making it an ideal choice for petrochemical, power generation, and industrial fastening. For higher temperatures or corrosive environments, upgrading to B16 or nickel-based alloys is recommended. Proper selection and installation maximize the ASME B18.31.2 All Thread Bar's performance advantages.
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