ASTM A192 High-Pressure Seamless Carbon Steel Boiler Tube

The production standards for seamless boiler steel tubes primarily include GB, ASTM, and DIN. ASTM A192, ASTM A179, and ASTM A210 are commonly adopted internationally.

ASTM A192 is the "Standard Specification for Seamless Carbon Steel Boiler Tubes for High Pressure Service" established by the American Society for Testing and Materials (ASTM).

ASTM A192 Boiler Tube Standard

ASTM A192, developed by the American Society for Testing and Materials (ASTM), specifies the technical requirements for seamless carbon steel boiler tubes, covering core specifications such as chemical composition, mechanical properties, dimensional tolerances, and inspection methods.

ASTM A192 Boiler Tube Dimensions

1. Outside Diameter Range

Typically 1/2 inch to 7 inches (12.7 to 177.8 mm). Other sizes are available, provided they meet the other requirements of this standard.

2. Wall Thickness Range

Minimum wall thickness is 0.085" to 1.000" (2.2 to 25.4 mm), inclusive.

3. Length Requirements

We can provide single random lengths, double random lengths, or custom lengths. Lengths are generally 27 meters.

ASTM A192 Boiler Tube Technical Requirements

1. Chemical Composition

Carbon: 0.06%-0.18%

Silicon: ≤0.25%

Manganese: 0.27%-0.63%

Phosphorus: ≤0.035%

Sulfur: ≤0.035%

2. Mechanical Properties

Tensile Strength: ≥325 MPa

Yield Strength: ≥180 MPa

Elongation: ≥35%

Brinell Hardness: ≤137 HB

Rockwell Hardness: ≤77 HRB

3. Dimensional Tolerances

Outer Diameter Tolerance: +0.4 mm to -1.2 mm (hot-rolled tube); +0.10 mm to +0.38 mm (cold-drawn tube)

Wall Thickness Tolerance: +20% to 0% (cold-drawn tube); +28% to 0% (hot-rolled tube)

ASTM A192 Boiler Tube Manufacturing Process

It can be manufactured using either hot working or cold working processes.

Hot-worked boiler tubes do not require heat treatment, while cold-worked boiler tubes require heat treatment at 1200°F (650°C) or higher after final cold working to eliminate internal stresses caused by cold working, improve the steel's microstructure and mechanical properties, and enhance its toughness and fatigue resistance.

ASTM A192 Boiler Tube Advantages

1. Seamless Construction

It is a seamless steel pipe without welded joints, providing excellent strength and reliability under high pressure conditions.

2. High-Pressure Resistance

Designed to withstand extreme pressures, suitable for boilers and heat exchangers.

3. Heat Resistance

Can withstand high temperatures, ensuring consistent performance in high-temperature environments.

4. Durability

Made from high-quality carbon steel for long-lasting performance.

5. Custom Sizes

A variety of sizes and thicknesses are available to meet specific project needs.

ASTM A192 Boiler Tubes Quality Inspection

1. Flattening Test

This tests the steel tube's deformation and damage resistance under axial pressure, ensuring it can withstand the external pressures expected in actual use.

2. Flaring Test

This evaluates the tube's radial expansion performance to prevent cracks or ruptures during installation or use.

3. Hydrostatic Test

This tests the tube's leak-tightness and pressure resistance, ensuring it will not leak when subjected to internal fluid pressure, thus ensuring the proper operation of high-pressure equipment.

Non-destructive testing may be used in lieu of hydrostatic testing, depending on the purchaser's requirements.

Pressure Rating of ASTM A192 Boiler Tubes

The maximum working pressure of ASTM A192 boiler tubes at 400°F. Dimensions (outer diameter and wall thickness) comply with ANSI B36.10.

Applications of ASTM A192 Boiler Tubes

1. Power Generation

Used in high-pressure steam boiler systems in power plants.

2. Superheater

Essential equipment for increasing steam temperature without increasing pressure.

3. Heat Exchangers

Used in high-pressure heat exchangers to transfer heat between fluids.

4. Chemical Industry

Suitable for the high-pressure, high-temperature environments found in chemical processing.

Summary

ASTM A192 boiler tubes offer excellent resistance to high temperatures and pressures. They are widely used in the manufacture of high-temperature and high-pressure equipment such as boilers, superheaters, and heat exchangers, playing a vital role in the power, chemical, and petroleum industries.

Read more: ASTM A106 vs. ASTM A192: Which Is Better for Boiler Tubes?