BS970: Part 1 – 1983 / 1991

The BS970: Part 1 (1983, amended 1991) British Standard defines the chemical compositions and mechanical properties of steel grades widely used in precision engineering, manufacturing, and industrial applications. This specification ensures material consistency, making it essential for industries requiring high-performance carbon, alloy, and stainless steels.

Below are some of the most common steel grades covered by BS970: Part 1, with links to their detailed chemical compositions and properties:

Common Carbon & Alloy Steels

  • EN1A (040A15) – Free-cutting mild steel with excellent machinability.
  • EN3B (080A15) – General-purpose carbon steel for welding and fabrication.
  • EN8 (080M40) – Medium carbon steel for high-strength components like shafts and gears.
  • EN9 (070M55) – High-carbon steel offering superior wear resistance for tools and springs.
  • EN16 (605M36) – Nickel-chromium-molybdenum alloy steel for high-toughness applications.
  • EN19 (709M40) – Chromium-molybdenum steel for heavy-duty forgings and stressed parts.

Popular Stainless Steels

  • 304S15 (EN56E) – Austenitic 18/8 stainless steel (corrosion-resistant for food and architecture).
  • 316S16 (EN58J) – Molybdenum-enhanced stainless steel for marine and chemical environments.
  • 303S21 (EN58M) – Free-cutting stainless steel for machined components.

Tool Steels

  • EN42 (060A96) – High-carbon tool steel for cutting implements and blades.
  • EN44 (527A19) – Chromium-vanadium steel for durable tools and bearings.

Key Applications of BS970: Part 1 Steels

These grades are trusted in:

  • Machinery: Gears, shafts, and bolts (e.g., EN8, EN19).
  • Automotive: Engine components, axles, and transmission parts.
  • Construction: High-strength fasteners and structural reinforcements.
  • Toolmaking: Drill bits, dies, and wear-resistant tools (e.g., EN42, EN44).

For full technical datasheets or custom inquiries, contact us.

Why BS970: Part 1?

  • Standardized Quality: Strict composition limits for reliability.
  • Wide Compatibility: Matches equivalent EN, AISI, and ASTM grades.
  • Proven Performance: Trusted by UK engineers for decades.
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