I. Mechanical properties

• Tensile strength: 515-700 MPa Test standard: ASTM A240

• Yield strength: 205-450 MPa Test standard: ASTM A240

• Elongation: 40-60% Test standard: ASTM A240

• Hardness: 187-250 HB Test standard: ASTM E18

• Elastic modulus: 193 GPa Test standard: ASTM E111

• Impact toughness: 100-120 J/cm² Test standard: ASTM E23

II. Physical properties

• Density: 7.93 g/cm³; lightweight design advantage

• Melting point: 1398-1454℃; high temperature processing window

• Thermal conductivity: 16.3 W/(m·K) at 20℃; heat dissipation performance optimization

• Specific heat capacity: 500 J/(kg·K); thermal stability control

• Linear expansion coefficient: 17.2×10⁻⁶/℃ (20-100℃); dimensional stability of precision components

• Resistivity: 0.73 μΩ·m; electromagnetic shielding application

III. Application fields

1. Car body manufacturing

The structural parts produced by the continuous stamping process of S30300 steel coils reduce the weight of the car body by 10%, which is equivalent to reducing the weight of each car by 50 kg. Calculated based on the average energy consumption of new energy vehicles, this can increase the cruising range by 6-8%. A certain OEM uses 0.6 mm ultra-thin steel coils to manufacture car door anti-collision beams, which have an energy absorption effect 30% higher than traditional steel in the C-NCAP collision test.

2. Battery shell

After stamping the 0.8 mm steel coil, the weight of the battery shell is 12% lighter than that of aluminum alloy, and the corrosion resistance of electrolyte is increased by 200%. Actual measurements show that the structural strength of the battery pack manufactured by it remains over 95% in the cycle from - 40℃ to 80℃.

3. Medical devices

After electrolytic polishing, the surface roughness of 0.15mm ultra-thin S30300 steel coil is Ra<0.2μm, with excellent biocompatibility and fatigue strength exceeding 500MPa. It has been used in cardiovascular stents. Its thin ductility helps the personalized customization of orthopedic implants in 3D printing, which speeds up postoperative healing by 40%.

4. Electronic information

S30300 steel coil has achieved breakthroughs in many fields: 0.05mm ultra-thin steel foil is used as the support layer of the flexible screen of folding screen mobile phones, with a bending resistance of more than 200,000 times and electromagnetic shielding of 85dB+; it is used in satellite sailboard hinges, and the dimensional error is less than 0.01mm under the extreme temperature difference in space.

IV. Precautions

1. Key points for processing and forming

S30300 steel coils are easy to harden by cold rolling. It is recommended to use a twelve-roll precision rolling mill. After annealing and heat preservation at 750-800℃ for 30 minutes, stress can be effectively eliminated. Practice shows that when parts manufacturers use ceramic tools for high-speed cutting, the feed rate is controlled at 0.1-0.15mm/r to achieve ideal surface finish.

2. Storage and transportation specifications

Steel coils need to be stored in a ventilated warehouse with a humidity of less than 60% to avoid contact with carbon steel to cause electrochemical corrosion. Use shock-proof brackets to fix during transportation, and ultra-thin specifications below 0.3mm are vacuum-filled with nitrogen to prevent oxidation. The intelligent monitoring system of a logistics company monitors temperature, humidity and vibration in real time, reducing the damage rate of steel coils to less than 0.1%.

V. Conclusion

S30300 stainless steel coils break the boundaries of material applications with ultra-thin technological innovation and become the core driving force of industrial transformation in the fields of new energy and aerospace. Bolaibao relies on its professional platform advantages to promote efficient collaboration between upstream and downstream companies, promote the widespread application of this material in strategic emerging fields, and lead the stainless steel industry into a new stage of development.

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