GOST 20 Alloy Steel Bar GOST 20 Round Bars GOST 20 Rods

Product Description

GOST 20 (often written as Steel 20 or St20) is a high-quality structural carbon steel widely used in Eastern European and Russian engineering standards (GOST 1050). It is a "workhorse" material favored for its excellent weldability, ductility, and reliability in pressure-vessel and mechanical applications.

1. Chemical Composition

GOST 20 is a medium-carbon steel. The number "20" represents the average carbon content in hundredths of a percent (approximately 0.20%).

2. Mechanical Properties

In its standard hot-rolled or normalized state, GOST 20 provides a balanced profile:

• Tensile Strength ($\sigma_b$): $\ge$ 410 MPa

• Yield Strength ($\sigma_s$): $\ge$ 245 MPa

• Elongation ($\delta_5$): $\ge$ 25%

• Hardness (Brinell): $\le$ 163 HB (normalized)

• Operating Temperature: Effective from -40°C to +450°C.

3. Key Characteristics & Processing

• Weldability: Excellent. It can be welded without preheating or post-weld heat treatment (PWHT) in most thicknesses.

• Heat Treatment: * Normalization: Typically performed at 880–910°C to refine grain structure.

  • Carburizing (Case Hardening): Used to achieve high surface hardness (e.g., for gears) while maintaining a tough, ductile core.

• Forms: Commonly supplied as Round Bars, Rods, Seamless Pipes, and Hexagons.

4. Global Equivalents

If you are sourcing materials internationally, GOST 20 is closely comparable to the following grades: