What are the equivalent standards of ASTM A106?

ASTM A106 is one of the most commonly used standards for high-temperature seamless carbon steel pipes worldwide, and is widely applied in boilers, power plants, petrochemicals and oil refining industries.
In international procurement and engineering projects, engineers and purchasers often encounter such a question: What does ASTM A106 correspond to in other national standards?

This article will provide a complete equivalent standard comparison table, covering standards such as ASME, API, EN, DIN, BS, and JIS, and analyze the differences in their chemical composition and mechanical properties to help you make the right substitution and selection.

Introduction to ASTM A106
ASTM A106 is mainly applicable to seamless carbon steel pipes under high-temperature working conditions and is divided into three grades: Grade A, Grade B, and Grade C. Among them, Grade B is the most common in the market.

Common applications

High-temperature conveying pipeline
Boiler and Heat Exchanger

Power generation system pipeline

Equivalent standard comparison table

Standard	Grade	Chemical Composition (max %, unless noted)	Mechanical Properties
ASTM A106	Gr. B	C ≤ 0.30, Mn 0.29–1.06, P ≤ 0.035, S ≤ 0.035, Si ≥ 0.10	Tensile ≥ 415 MPa, Yield ≥ 240 MPa, Elong ≥ 30%
ASME SA106	Gr. B	Same as ASTM A106	Same as ASTM A106
API 5L	Grade B	C ≤ 0.28, Mn ≤ 1.20, P ≤ 0.030, S ≤ 0.030	Tensile ≥ 415 MPa, Yield ≥ 245 MPa
EN 10216-2	P265GH	C ≤ 0.20, Mn 0.80–1.40, P ≤ 0.025, S ≤ 0.015	Tensile 410–530 MPa, Yield ≥ 265 MPa
DIN 17175	St45.8	C ≤ 0.21, Mn 0.40–1.20, P ≤ 0.025, S ≤ 0.025	Tensile 410–530 MPa, Yield ≥ 255 MPa
BS 3059 Pt.2	360	C ≤ 0.23, Mn 0.40–1.06, P ≤ 0.040, S ≤ 0.040	Tensile 360–500 MPa, Yield ≥ 235 MPa
JIS G3454	STPG410	C ≤ 0.25, Mn 0.30–0.90, P ≤ 0.035, S ≤ 0.035	Tensile ≥ 410 MPa, Yield ≥ 245 MPa

Precautions

Although these standard performances are similar, they cannot be completely equated and interchanged, especially when used in pressure vessels or high-temperature working conditions, the chemical composition, mechanical properties and design specification requirements need to be rechecked.
If it is a boiler or heat exchanger project, it is recommended to directly use ASTM A106 GR.B or high-temperature standard steel pipes of equal strength.

Key analysis

1. Chemical composition differences
EN 10216-2 P265GH has a lower carbon content, stricter control over phosphorus and sulfur content, and better welding performance.
Although API 5L Grade B has similar strength, it is mainly used in conveying pipelines rather than high-temperature boilers.

2. Differences in mechanical properties
The yield strength of the European standard (EN/DIN) is generally higher than that of ASTM A106 Gr.B (240 MPa).
The tensile strength requirement of BS 3059 Pt.2 360 is lower and it is not suitable for high-pressure and high-temperature substitution.

3. Application Precautions
ASTM A106 or EN 10216-2 P265GH is recommended for high-temperature working conditions.
API 5L Grade B is optional for oil and gas pipelines.
The boiler tubes can be selected as DIN 17175 St45.8 or BS 3059.

How does ASTM A106 GR.B compare with ASTM A53 GR.B?

The strength levels of ASTM A106 Gr.B and ASTM A53 Gr.B are similar. However, A106 Gr.B is specifically designed for high-temperature and high-pressure working conditions, only allows seamless manufacturing, has stricter chemical composition control (especially restrictions on silicon, phosphorus, and sulfur), and has better high-temperature resistance and oxidation resistance. It is applicable to high-temperature and pressure systems such as boilers, heat exchangers, petrochemicals, etc. A53 Gr.B is positioned for normal temperature and low pressure conveying or structural applications. It can be seamless or welded, and has a relatively low manufacturing cost. However, it is not suitable to replace A106 Gr.B in high-temperature and high-pressure environments.

Frequently Asked Questions About ASTM A106 Pipe（FAQ）

Does ASTM A106 include welded pipe?

Q: No. ASTM A106 is limited to seamless pipe; there are no provisions for welded pipe in the standard. This is one of the key differences between A106 and A53.

What is the maximum service temperature for ASTM A106 Grade B?

Q: The maximum design service temperature is approximately 427°C (800°F). Long-term use above 425°C may lead to graphitization, resulting in a decrease in strength.

What is the difference between ASTM A106 and API 5L?

Q: ASTM A106 is commonly used for high-temperature process piping within plants; API 5L is used for long-distance oil and gas pipelines. Both Grade B have similar strengths (yield strength 240~245 MPa, tensile strength 415 MPa), but A106 emphasizes high-temperature performance, while API 5L emphasizes pipeline transportation and toughness requirements (PSL2 forced impact test).

Summary

ASTM A106 Grade B has multiple equivalent standards worldwide. However, due to differences in chemical composition, mechanical properties and applications, careful evaluation must be conducted before substitution.

Read more : ASTM A106 schedule 40 dimensions