ASTM A249, ASTM A269 ,ASTM A312 WELDED TUBE/PIPE

ASTM A249, ASTM A269, and ASTM A312 are among the most critical standards for welded austenitic stainless steel tubing and pipe in industrial applications. These specifications ensure that materials meet rigorous requirements for quality, dimensions, and performance in various service conditions, from general corrosion resistance to high-temperature environments.

Key Features & Benefits

Tubing conforming to ASTM A249, A269, and A312 standards shares several key characteristics. They are manufactured from austenitic stainless steel grades like 304/304L, 316/316L, 321, 347, and duplex steels. These grades are chosen for their excellent corrosion resistance, high strength and durability, and good formability and weldability.

A significant feature of these tubes, especially under ASTM A269, is the availability of BA (Bright Annealed) finish. BA tubes undergo a process where they are cold worked and then annealed in a controlled atmosphere (like pure argon) to achieve a very smooth, clean, and bright surface without the need for mechanical polishing. This results in superior surface cleanliness and dimensional accuracy (e.g., ±0.05mm).

These tubes can be supplied in both welded and seamless forms, though A249 specifically covers welded tubes for heat exchangers, boilers, superheaters, and condensers. They undergo stringent non-destructive testing (NDT), such as eddy current tests, hydrostatic tests, and flaring tests, to ensure integrity

Technical Specification

Chemical Composition (%)

Mechanical Properties:

Specification

Frequently Asked Questions (FAQ)

Q1: What is the main difference between ASTM A249 and ASTM A269?
A1: ASTM A249 specifically covers welded austenitic stainless steel tubes intended for use in boilers, superheaters, heat exchangers, and condensers. ASTM A269 covers both seamless and welded austenitic stainless steel tubes for general corrosion-resisting and temperature service. A269 is also the common standard for BA (Bright Annealed) tubes.

Q2: Can ASTM A312 tubes be used for high-pressure applications?
A2: Yes, ASTM A312 tubes, being designed for general corrosion-resisting and high-temperature service, can be used in various pressure applications. However, for specific high-pressure roles like boiler tubes, standards like A209 (for seamless carbon-molybdenum alloy-steel tubes) or A249 might be more directly applicable, and the final selection should always adhere to the applicable pressure vessel code.

Q3: What does "BA" mean in the context of stainless steel tubing?
A3: BA stands for Bright Annealing. It's a process where the tube is annealed in a controlled atmosphere (e.g., argon) to prevent oxidation, resulting in a smooth, bright, and clean surface that is ideal for high-purity applications without requiring further mechanical polishing. ASTM A269 is a common standard specifying BA tubes.

Q4: What are the common material grades under these specifications?
A5: The most common grades across A249, A269, and A312 are 304/304L and 316/316L. Other grades include 321/321H, 347/347H, 310S, and duplex steels, chosen based on specific corrosion and temperature requirements.

Kasugai Group supply pipe fittings,steel pipes and flanges products more than 100 years,If you want to know more about our piping products,please email us:zhangying@kasugai-group.co.jp

Kasugai Shanghai, a subsidiary of Kasugai Group headquartered in Osaka, Japan, was established in 2003 as a representative office in Shanghai, China, and was upgraded to a company in 2008. Kasugai Shanghai serves as an important force of Kasugai Group in Asia, and over the past 20 years, it has become a key player in the industrial pipes, fittings, flanges, and valves market.

Kasugai Shanghai leverages the resources and manufacturing capabilities of local suppliers in China to provide a wide range of products, including stainless steel, carbon steel, duplex/super duplex steel, alloy steel, nickel alloy, and titanium alloy, according to various international standards such as ASTM/ASME/ANSI, JIS, EN, and DIN. The company also has a local support team and an on-site quality inspection team to ensure that products meet the specifications and quality requirements of customers.

With the support of high-quality local suppliers and a strong commitment to customer satisfaction, Kasugai Shanghai strives to provide reliable products and services to customers in Asia and beyond. Kasugai Group's establishment of Kasugai Shanghai and other international operations demonstrates their proactive approach to globalization and their commitment to meeting the needs of customers in a rapidly changing global market.

Kasugai Group Company Profile:

Foundation : June, 1925

Legal Representative : Akinori Kasugai

Number of employees : 140 persons (150 persons including employees of the affiliates) As of March 21, 2023

Scope of business : wholesaler and trade firm of industrial pipe/tube, fittings, flanges and valves

Kasugai Group Locations:

Head Office

4-14-2 Shinmachi, Nishi-ku, Osaka 5500013, Japan

TEL: 81-6-6538-7281

FAX: 81-6-6538-2273

E-MAIL: contact@kasugai-group.co.jp

Shanghai

Rm. A8415 Building A8, No. 808 Hongqiao Road, Xuhui District, Shanghai 200030, China.

TEL: 86-21-6447-1967

FAX: 86-21 6447-7841

E-MAIL: zhanghb@kasugai-group-co.jp

Other Branch Offices and Joint Ventures:

Fukuoka, Kitakyushu, Tokai, Kyoto, Shunan, Tokyo, USA (Watchung, N.J.), Jiangyin (Jiangsu, China)

Our Strengths:

Since our foundation in 1925, we have continuously taken steps to further grow our businesses. Global capabilities, professionalism, and trust. These three strengths are the reason that customers continue to choose Kasugai, regardless of the period.

-Global capabilities

We embarked on overseas procurement ahead of our competitors in the industry and have established a supplier network that can meet a variety of market demands. We are successfully chosen by many overseas customers
as a global procurement partner.

- Professionalism

Leveraging expertise cultivated over many years, we deliver optimal products to the optimal place at the optimal time. Our excellent information gathering and problem-solving abilities are also invaluable for solving customer issues.

- Trust

We provide smooth, prompt services by cultivating solid relationships of trust with suppliers. We believe that building stronger partnerships is the source of our growth.