A182 F22 Class 3 Alloy Steel Round Bar(F-22 Bars, F22 Rods)

Product Description

ASTM A182 F22 Class 3 is a high-performance forging specification for 2.25Cr-1Mo low-alloy steel. It is the industry standard for high-temperature and high-pressure service, particularly in oil and gas "wellhead" applications and power generation.

Among the F22 designations, Class 3 is the strongest and most commonly specified for critical pressure-containing parts due to its superior tensile and yield requirements compared to Class 1.

1. Core Technical Profile

The addition of 2.25% Chromium and 1% Molybdenum provides excellent resistance to creep and hydrogen attack, particularly in high-temperature environments.

2. Condition & Supply

F22 Class 3 bars are typically supplied in a Normalized and Tempered (N+T) or Quenched and Tempered (Q+T) condition. This heat treatment is critical to ensuring the material can withstand "High Temperature Hydrogen Attack" (HTHA) in refinery services.

Common commercial forms include:

• Round Bars & Rods: Used for machining into high-tensile fasteners, valve stems, and connectors.

• Forged Rings: Used for large-scale flanges and tube sheets.

• Finish: Available in Black (as forged), Bright (cold drawn), or Peeled & Polished for precision engineering.

3. Popular F22 Class 3 Bar Options

If you are looking for specific stock sizes or forged components, these are common industrial offerings:

A182 F22 Class 3 Round Bar (10mm)

A smaller diameter rod suitable for high-strength pins, studs, and specialized fasteners used in high-pressure manifolds.

• Material: 2.25Cr-1Mo Alloy Steel

• Key Feature: High yield strength for compact, high-load components.

ASTM A182 F22 Round Bar (16mm, 3 Meter)

A standard-length bar often used for production machining. The 16mm diameter is a common size for manifold fittings and valve internal components.

• Condition: Normalized & Tempered

• Key Feature: Excellent weldability and corrosion resistance in chemical processing.

Alloy Steel F22 Forged Bar

For heavy-duty applications, forged bars provide a refined grain structure that is superior for resisting impact and cyclic fatigue in large-scale machinery.