Stainless Steel

The Perfect Combination of Corrosion Resistance, High Strength and Economy

ASTM A312 TP904L ERW welded pipes deliver superior corrosion resistance in sulfuric acid, phosphoric acid, and marine environments. MTSCO’s ISO9001-certified ERW process ensures dimensional precision and weld integrity through X-ray testing, offering cost-effective solutions for chemical, desalination, and pharmaceutical industries.

The ASTM A312 standard covers austenitic stainless steel piping, and 904L is one of its high-performance representatives. 904L has excellent corrosion resistance due to its ultra-low carbon content and high nickel and molybdenum ratios, especially against acidic media such as sulfuric acid, phosphoric acid, acetic acid, and chlorine-containing environments. In addition, its copper content further enhances its resistance to reducing acids, making it widely used in the chemical, desalination and pharmaceutical industries.

The ERW (Electric Resistance Welding) process is an important technical method for making ASTM A312 TP904L welded pipes. It works by heating the edges of the pipe billet with electrical resistance and quickly welding the pipe together under high temperature and pressure. This process results in pipes with uniform weld seams, excellent surface quality and high productivity, especially for high-volume industrial applications. Compared to traditional seamless pipes, ERW welded pipes offer higher productivity and more precise control of wall thickness and diameter, making them suitable for scenarios that require high dimensional accuracy.

Typical applications for 904L ERW welded pipes include acid condensers in sulfuric acid production units, process piping in phosphoric acid production lines, corrosion-resistant equipment in the petroleum refining industry, and delivery piping in seawater desalination systems. Due to the excellent corrosion resistance, the service life is long and maintenance costs are significantly reduced.

As a professional industrial pipe manufacturer, MTSCO understands the technical requirements of ASTM A312 standard. Relying on strict quality control system and advanced production equipment, such as CNC bending machine, automatic welding unit and ultrasonic eddy current integrated testing equipment, to ensure that each welded pipe meets the international first-class standard. MTSCO selects high quality raw materials from Baosteel, Tsingshan and other large steel mills in the production of 904L ERW welded pipes, and all the products are subject to 100% X-ray weld inspection, hydraulic pressure test and strict dimensional and appearance inspection to meet the customers' high requirements for safety and reliability.