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Alloy Steel Stud Bolt
QS Fastener: Alloy Steel Stud Bolt
Name: Alloy Steel Stud Bolt
Standard: ANSI B18.31.2
Material: ASTM A193 B7
Surface Coating: PTFE 1424 Blue
Thread: 8 UN
Size: 1-1/8 Inch
Length: 230mm
Usage : Fully Thread Stud Bolt for Flanges, Joints and Valves Installation.
Standard: ANSI B18.31.2
Material: ASTM A193 B7
Surface Coating: PTFE 1424 Blue
Thread: 8 UN
Size: 1-1/8 Inch
Length: 230mm
Usage : Fully Thread Stud Bolt for Flanges, Joints and Valves Installation.
Quantity
Alloy Steel Stud Bolt is manufactured in compliance with ANSI B18.31.2 standards. Its distinctive PTFE 1424 blue coating provides exceptional corrosion and chemical resistance, making it particularly suitable for demanding applications such as high-pressure flanges in oil pipelines, LNG valves, and chemical equipment.
Hot Rolling and Forging Processes for Alloy Steel Stud Bolt
As critical components for high-pressure flanges in oil pipelines and other severe service conditions, the performance of fasteners depends directly on their manufacturing processes. Below are the core production control technologies for Alloy Steel Stud Bolt under ASTM A193 B7 standards:
As critical components for high-pressure flanges in oil pipelines and other severe service conditions, the performance of fasteners depends directly on their manufacturing processes. Below are the core production control technologies for Alloy Steel Stud Bolt under ASTM A193 B7 standards:
1. Hot-Rolled Bar Process Control
- Composition Design:
The 4140 steel system, specifically designed for Alloy Steel Stud Bolt, incorporates Nb/V micro-alloying (0.02-0.05%) with a carbon equivalent of 0.65-0.75.
- Composition Design:
The 4140 steel system, specifically designed for Alloy Steel Stud Bolt, incorporates Nb/V micro-alloying (0.02-0.05%) with a carbon equivalent of 0.65-0.75.
- Rolling Temperature Profile:
The steel used for Alloy Steel Stud Bolt undergoes three-stage heating (1250℃→1180℃), with a final rolling temperature of 860-880℃ in the critical zone and a cooling rate of 15-20℃/s.
The steel used for Alloy Steel Stud Bolt undergoes three-stage heating (1250℃→1180℃), with a final rolling temperature of 860-880℃ in the critical zone and a cooling rate of 15-20℃/s.
- Dimensional Accuracy:
Tolerance control for Alloy Steel Stud Bolt bars:
≤30mm: ±0.25mm
>50mm: ±0.35mm
Tolerance control for Alloy Steel Stud Bolt bars:
≤30mm: ±0.25mm
>50mm: ±0.35mm
2. Forming Process Comparison for Alloy Steel Stud Bolt
- Cold Heading (≤M24)
- Cold Heading (≤M24)
| Size | Forming Force (kN) | Die Life (10k pieces) |
| M12 | 800-1000 | 20-25 (common sizes) |
- Hot Heading (>M24)
| Parameter | Cold Heading Process | Hot Heading Process |
| Surface Roughness | Ra1.6-3.2μm (high-grade surface) | Ra6.3-12.5μm |
3. Performance Improvement with Forging Ratio ≥4:1 for Alloy Steel Stud Bolt
- The"two-upsetting-two-drawing"process increases Alloy Steel Stud Bolt's tensile strength by 8-10% (reaching 920MPa) and impact energy by 22% (up to 65J).
- The"two-upsetting-two-drawing"process increases Alloy Steel Stud Bolt's tensile strength by 8-10% (reaching 920MPa) and impact energy by 22% (up to 65J).
4. Advanced Processes Applied to Alloy Steel Stud Bolt
- Warm Heading Composite Process:
Reduces forming force by 35% for M24-M36 sizes, with oxide layer <20μm.
- Warm Heading Composite Process:
Reduces forming force by 35% for M24-M36 sizes, with oxide layer <20μm.
- Full Fibre Forging:
Achieves Alloy Steel Stud Bolt material utilization rate of 92%, increasing fatigue limit by 50%.
Achieves Alloy Steel Stud Bolt material utilization rate of 92%, increasing fatigue limit by 50%.
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