ASTM A320 Gr. B8 Bolt

Name: ASTM A320 Gr. B8 Bolt
Brand: JIGNESH STEEL
Price: 120.0 INR
Availability: InStock

Price 120.0 INR/ Piece

Get a Price/Quote

MOQ : 20 Pieces

ASTM A320 Gr. B8 Bolt Specification

Corrosion Resistant
Yes

Surface Treatment
Polishing

Grade
304

Finish
Buffed

Drive Type
Hex, Square, 12-Point (Flange), Slotted, Phillips, Allen, etc

Thread Type
Unified

Head Type
Hex Head, Socket Head, Countersunk Head, T-Head etc

Fasteners Type
Bolts

Material
Stainless Steel

Color
Self Finish

About ASTM A320 Gr. B8 Bolt

ASTM A320 Grade B8 Fasteners are specialized, high-performance alloy and stainless steel bolting materials explicitly designed for low-temperature, sub-zero, and cryogenic service applications. Manufactured from AISI 304 austenitic stainless steel, these fasteners are crucial components for sealing and securing valves, piping flanges, fittings, and pressure vessels carrying hazardous or ultra-cold liquids.

Technical Specification Overview

Property / Feature		Technical Specifications
Material Base		AISI 304 Stainless Steel (18% Chromium, 8% Nickel)
Industry Service Type		Deep Cryogenic and Low-Temperature Conditions
Minimum Temperature Threshold		Engineered to perform down to -325F (-198C)
Manufacturing Configurations		Class 1: Carbide Solution Annealed (Standard strength) Class 2: Carbide Solution Annealed + Strain Hardened (High strength)
Tensile Capacity (Class 1)		75 ksi (515 MPa) minimum
Tensile Capacity (Class 2)		125 ksi (860 MPa) minimum for diameters up to 3/4"
Yield Capacity (Class 1)		30 ksi (205 MPa) minimum
Yield Capacity (Class 2)		100 ksi (690 MPa) minimum for diameters up to 3/4"
Impact Validation		Charpy V-Notch testing required for specific classes to confirm sub-zero ductility
Standard Head Marking		B8 (Accompanied by a unique manufacturer symbol, such as JS)
Mating Components		ASTM A194 Grade 8 Heavy Hex Nuts

Key Product Performance Pillars

Cryogenic Fracture Protection: Standard structural steels can drop below their ductile-to-brittle transition point and shatter in deep cold. ASTM A320 Grade B8 avoids this failure entirely by maintaining superb notch toughness and impact absorption when handling liquefied gases.

Solution-Annealed Protection: The base Class 1 components undergo severe heating followed by a fast water-quench cycle. This carbide-solution treatment eliminates structural weak zones and optimizes uniform material consistency.

Strain-Hardened Mechanical Gains: For applications that require high structural clamping loads, the Class 2 cold-working process elevates the yield threshold from a modest 30 ksi up to a demanding 100 ksi capacity.

Passivated Anti-Corrosion Layer: The dense chromium-nickel metallic structure forms a transparent, self-healing passivated layer. This barrier keeps moisture, ice buildup, and corrosive atmospheres from degrading thread interfaces.

Core Technical Applications

These high-integrity fasteners are heavily utilized in processing networks dealing with ultra-cold materials:

LNG (Liquefied Natural Gas) Terminals: Securing storage tank connections, marine loading lines, and pipeline transfers.

Industrial Cryogenic Gas Systems: Handling liquid nitrogen, liquid oxygen, argon, and carbon dioxide infrastructure.

Chemical & Pharmaceutical Refining: Low-temperature chemical processing loops and refrigerated jacketed vessel joints.

Polar Maritime Infrastructure: Heavy equipment assemblies deployed in frozen, sub-zero Arctic and marine environments.

Tell us about your requirement