How to Select the SS304 Fastener
author: www.qishine.com
2025-03-02
SS304 Fastener: The Perfect Combination of Strength and Durability!
The SS304 Fastener is made from ASTM A193 Gr B8 SS304 stainless steel, offering excellent corrosion resistance and high strength, making it suitable for various demanding environments. Compliant with the ANSI B18.2.1standard, it ensures superior quality and is widely used in construction, manufacturing, and industrial fields. Choose the SS304 Fastener for a durable and reliable solution for your projects!
The SS304 Fastener is made from ASTM A193 Gr B8 SS304 stainless steel, offering excellent corrosion resistance and high strength, making it suitable for various demanding environments. Compliant with the ANSI B18.2.1standard, it ensures superior quality and is widely used in construction, manufacturing, and industrial fields. Choose the SS304 Fastener for a durable and reliable solution for your projects!
How to Select the SS304 fastener?
Below are the application environments and selection recommendations for different grades of SS304 fastener:
1. Class 1: Suitable for Low-Pressure, Low-Temperature, or Vibrational Environments
1.1 Application Scenarios
Food Equipment: Used for bolted connections in food processing equipment, such as mixers, conveyors, and storage tanks;
Building Structures: Used for bolted connections in steel structures, such as bridges, curtain walls, and pipe supports;
Vibrational Environments: Suitable for mechanical equipment with vibrations, such as fans and pumps.
1.1 Application Scenarios
Food Equipment: Used for bolted connections in food processing equipment, such as mixers, conveyors, and storage tanks;
Building Structures: Used for bolted connections in steel structures, such as bridges, curtain walls, and pipe supports;
Vibrational Environments: Suitable for mechanical equipment with vibrations, such as fans and pumps.
1.2 Material Properties
Material: 304 stainless steel (ASTM A193 B8 Class 1);
Mechanical Properties:
Tensile Strength: ≥515 MPa;
Yield Strength: ≥205 MPa;
Elongation: ≥40%;
Hardness: ≤192 HB (Rockwell B90).
Corrosion Resistance: Suitable for weakly corrosive environments, such as air, freshwater, weak acids, and weak alkalis.
Material: 304 stainless steel (ASTM A193 B8 Class 1);
Mechanical Properties:
Tensile Strength: ≥515 MPa;
Yield Strength: ≥205 MPa;
Elongation: ≥40%;
Hardness: ≤192 HB (Rockwell B90).
Corrosion Resistance: Suitable for weakly corrosive environments, such as air, freshwater, weak acids, and weak alkalis.
1.3 Data Comparison
| Performance Indicator | Class 1 (SS304 fastener) | Comparative Material (Carbon Steel) |
| Tensile Strength (MPa) | 515 | 400–550 |
| Yield Strength (MPa) | 205 | 250–350 |
| Elongation (%) | ≥40 | 20–30 |
| Corrosion Resistance | Excellent | Poor |
1.4 Advantages
High Ductility: Elongation ≥40%, ideal for vibrational environments;
Corrosion Resistance: The SS304 fastener performs excellently in weakly corrosive environments; Cost-Effectiveness: Lower cost than Class 2, suitable for budget-limited projects.
High Ductility: Elongation ≥40%, ideal for vibrational environments;
Corrosion Resistance: The SS304 fastener performs excellently in weakly corrosive environments; Cost-Effectiveness: Lower cost than Class 2, suitable for budget-limited projects.
2. Class 2: Suitable for High-Pressure and High-Temperature Environments
2.1 Application Scenarios
Flange Connections: Used for bolted connections in pipelines, valves, and pumps (ASME B16.5 standard);
Boiler Systems: Used for bolted connections in low-pressure boilers;
Heat Exchangers: Used for bolted connections in low-pressure heat exchangers.
2.2 Material Properties
Material: 304 stainless steel (ASTM A193 B8 Class 2);
Mechanical Properties:
Tensile Strength: ≥860 MPa;
Yield Strength: ≥690 MPa;
Elongation: ≥12%;
Hardness: 248–352 HB (Rockwell C25–35).
Corrosion Resistance: Suitable for weakly corrosive environments but requires caution in high Cl⁻ environments.
Material: 304 stainless steel (ASTM A193 B8 Class 2);
Mechanical Properties:
Tensile Strength: ≥860 MPa;
Yield Strength: ≥690 MPa;
Elongation: ≥12%;
Hardness: 248–352 HB (Rockwell C25–35).
Corrosion Resistance: Suitable for weakly corrosive environments but requires caution in high Cl⁻ environments.
2.3 Data Comparison
| Performance Indicator | Class 2 (SS304 fastener) | Comparative Material (Alloy Steel) |
| Tensile Strength (MPa) | 860 | 800–1000 |
| Yield Strength (MPa) | 690 | 600–800 |
| Elongation (%) | ≥12 | 10–15 |
| Corrosion Resistance | Excellent | Average |
2.4 Advantages
High Strength: Tensile strength ≥860 MPa, ideal for high-pressure and high-temperature environments;
Corrosion Resistance: The SS304 fastener performs excellently in weakly corrosive environments;
Reliability: Strain-hardened, suitable for heavy-load scenarios.
High Strength: Tensile strength ≥860 MPa, ideal for high-pressure and high-temperature environments;
Corrosion Resistance: The SS304 fastener performs excellently in weakly corrosive environments;
Reliability: Strain-hardened, suitable for heavy-load scenarios.
3. Alternative Material: 316 Stainless Steel (ASTM A193 B8M)
3.1 Application Scenarios
High Cl⁻ Environments: Such as seawater, de-icing salt environments, and coastal areas;
Highly Corrosive Media: Such as concentrated sulfuric acid, hydrochloric acid, and chloride solutions.
High Cl⁻ Environments: Such as seawater, de-icing salt environments, and coastal areas;
Highly Corrosive Media: Such as concentrated sulfuric acid, hydrochloric acid, and chloride solutions.
3.2 Material Properties
Material: 316 stainless steel (ASTM A193 B8M);
Material: 316 stainless steel (ASTM A193 B8M);
Mechanical Properties
Tensile Strength: ≥515 MPa (Class 1), ≥860 MPa (Class 2);
Yield Strength: ≥205 MPa (Class 1), ≥690 MPa (Class 2);
Elongation: ≥40% (Class 1), ≥12% (Class 2);
Hardness: ≤192 HB (Class 1), 248–352 HB (Class 2).
Corrosion Resistance: 316 stainless steel contains 2–3% Mo, significantly enhancing Cl⁻ corrosion resistance.
Tensile Strength: ≥515 MPa (Class 1), ≥860 MPa (Class 2);
Yield Strength: ≥205 MPa (Class 1), ≥690 MPa (Class 2);
Elongation: ≥40% (Class 1), ≥12% (Class 2);
Hardness: ≤192 HB (Class 1), 248–352 HB (Class 2).
Corrosion Resistance: 316 stainless steel contains 2–3% Mo, significantly enhancing Cl⁻ corrosion resistance.
3.3 Data Comparison
| Performance Indicator | 316 (B8M) | SS304 fastener (B8) |
| Tensile Strength (MPa) | 515–860 | 515–860 |
| Yield Strength (MPa) | 205–690 | 205–690 |
| Elongation (%) | ≥40 (Class 1) | ≥40 (Class 1) |
| Cl⁻ Corrosion Resistance | Excellent | Average |
| Critical Pitting Temperature (CPT) | 35–40°C | 20–25°C |
3.4 Advantages
Cl⁻ Corrosion Resistance: 316 stainless steel performs excellently in seawater and high-salinity environments;
High-Temperature Performance: Better oxidation resistance than SS304 fastener at high temperatures;
Wide Applicability: Suitable for highly corrosive media and extreme environments.
Cl⁻ Corrosion Resistance: 316 stainless steel performs excellently in seawater and high-salinity environments;
High-Temperature Performance: Better oxidation resistance than SS304 fastener at high temperatures;
Wide Applicability: Suitable for highly corrosive media and extreme environments.
Selection Summary
| Scenario | Recommended Material | Advantages | Limitations |
| Low-Pressure, Low-Temperature, Vibrational Environments | SS304 fastenerClass 1 | High Ductility, Cost-Effectiveness | Not Suitable for High Cl⁻ Environments |
| High-Pressure, High-Temperature Environments | SS304 fastener Class 2 | High Strength, Reliability | Not Suitable for High Cl⁻ Environments |
| High Cl⁻ or Highly Corrosive Environments | 316 (B8M) | Cl⁻ Corrosion Resistance, High-Temperature Performance | Higher Cost |
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