Cold-rolled coil of high carbon steel S50C (introduction to hardness and material standards)

S50C; 50# Steel Comprehensive Analysis

‌1. Material Characteristics‌

• ‌Grade Standard‌: High-quality carbon structural steel under Chinese standard (GB/T 699-2015), with carbon content approximately 0.47%-0.55%5.
• ‌Mechanical Properties‌:
  • Tensile strength ≥630 MPa, yield strength ≥375 MPa, elongation ≥14%5.
  • High hardness (HB 170-210), but relatively low impact toughness5.
• ‌Machinability‌: Suitable for cutting, forging, welding, etc., but poor cold formability5.

‌2. Core Application Areas‌

• ‌Mechanical Manufacturing‌:
  • Gears, shaft components (machine tool spindles, engine crankshafts)5.
  • Wear-resistant parts such as rollers, tie rods, spring washers5.
• ‌Molds and Tools‌:
  • Cold work molds (punches, dies), suitable for small batch stamping of soft low-carbon steel plates5.
• ‌Construction and Engineering‌:
  • Steel structure connectors, hot-pressed forgings, seamless steel tubes5.

‌3. Comparison and Alternative Materials‌

• ‌Comparison with Bearing Steel‌: Slightly lower wear resistance but significant cost advantage5.
• ‌Comparison with Alloy Steel‌: Suitable for scenarios requiring high strength but low impact loads5.
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• Cold-rolled coil

  ‌50# Steel Core Application Areas and Examples‌

  ‌1. Mechanical Manufacturing (Core Application)‌

  • ‌Gears and Shaft Components‌:
    • Machine tool spindles, engine crankshafts, components requiring high wear resistance and static load bearing56.
    • Wear-resistant parts such as rollers and tie rods, commonly used in pressure processing equipment56.
  • ‌Molds and Tools‌:
    • Cold work molds (punches, dies), suitable for small batch stamping of soft steel plates5.

  ‌2. Construction and Engineering‌

  • ‌Steel Structure Connectors‌: Such as building supports, bridge fasteners5.
  • ‌Hot-Pressed Forgings‌: Structural components requiring high strength but low impact loads5.

  ‌3. Other Industrial Fields‌

  • ‌Pipes and Containers‌: Some pressure-resistant pipes, support structures for chemical equipment6.
  • ‌Wear-Resistant Liners‌: Screening plates for mining machinery, crusher components6.

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  ‌Typical Application Examples‌

  • ‌Case 1‌: A machinery factory used 50# steel to forge gears, achieving hardness of 45-52HRC and increasing lifespan by 30%6.
  • ‌Case 2‌: A construction project used 50# hot-rolled steel plates to make bridge load-bearing beams, 20mm thick, with normalizing treatment to ensure stability5.