The hardness state of 304 stainless steel strip (such as 1/4H, 1/2H, 3/4H, FH) is achieved by cold rolling, and different hardness states correspond to different mechanical properties and uses. The following are the descriptions, properties, parameters, dimensions and applications of these hardness states:

1. 1/4H (1/4 Hard)

• Hardness: Medium hardness, between soft and semi-hard.

• Tensile strength: about 700-900 MPa.
• Elongation: about 10-20%.
• Performance: With a certain strength and formability, suitable for medium strength processing.
• Application: It is often used in occasions that require certain strength and formability, such as electronic components, spring pieces, decorative strips, etc.

2. 1/2H (1/2 Hard)

• Hardness: semi-hard, harder than 1/4H.

• Tensile strength: about 900-1100 MPa.
• Elongation: about 5-15%.
• Performance: high strength, relatively low formability, suitable for high strength occasions.
• Application: Commonly used in springs, gaskets, medical equipment, automotive parts and so on.

3. 3/4H (3/4 Hard)

• Hardness: close to full hard state, high hardness.
• Tensile strength: about 1100-1300 MPa.
• Elongation: about 3-10%.
• Performance: High strength, poor formability, suitable for high strength applications.
• Application: High strength spring, precision parts, industrial equipment, etc.

4. FH (Full Hard)

• Hardness: All hard, the highest hardness.
• Tensile strength: about 1300-1500 MPa.
• Elongation: about 1-5%.
• Performance: Very high strength, almost no formability, suitable for applications requiring very high strength.
• Application: Used for high-load springs, blades, high-strength mechanical parts, etc.

Size range of 304 Stainless Steel Strip

• 304 stainless steel belt thickness and width range is wide, common sizes are as follows:
• Thickness: 0.03mm-3.0mm (depending on hardness state and application requirements).
• Width: 4mm-1500mm (can be customized according to customer needs)

Application field of 304 Stainless Steel Strips
304 stainless steel strip due to its excellent corrosion resistance, strength and processing properties, widely used in the following fields:

• Electronic appliances: spring plate, connector, shield, etc.
• Automotive industry: exhaust pipe, gasket, fastener, etc.
• Medical instruments: surgical instruments, medical tweezers, stents, etc.
• Architectural decoration: decorative strip, elevator panel, etc.
• Industrial equipment: high-load springs, precision parts, etc.

How to Choose the Hardness of stainless steel strip?

• 1/4H: Medium strength, suitable for occasions with medium formability requirements.
• 1/2H: High strength, suitable for springs and mechanical parts.
• 3/4H: High strength, suitable for precision parts and high load applications.
• FH: Very high strength, suitable for high load springs and blades.

The selection needs to be balanced according to the requirements of strength, hardness and formability in the specific application scenario.