Defects prone to occur in the welding zone of spiral submerged arc welded steel pipes include porosity, hot cracking, and undercut. 1. Bubbles. Bubbles often occur in the center of the weld bead. The main reason is that hydrogen gas remains hidden inside the weld metal in the form of bubbles. The

First, how to calculate the length of stainless steel pipe fittings. 1. 1.5 times the center height of the elbow = nominal diameter * 1.524. Essentially, it's nominal diameter * multiple. Round the result to the nearest integer. For example, a 219 elbow has a nominal diameter of 200, so the center

① Heat treatment of seamless steel pipes: a. Heating: Heating below Ac1 mainly stabilizes the steel's microstructure and eliminates internal stress. Heating above Ac3 is mainly for austenitizing the steel. b. Holding: The purpose is to uniformize the heating temperature of the seamless steel pipe

09CrCuSb straight seam steel pipe, as a type of steel resistant to sulfuric acid dew point corrosion, has significant application value in industries such as power, chemical, and metallurgy. The name of this steel originates from its chemical composition: 09 represents a carbon content ≤0.09%, with

First, the concepts of galvanized steel pipes and stainless steel pipes are different. ● Galvanizing involves coating a layer of zinc onto the outer layer of a steel plate. This prevents corrosion and extends the lifespan of the galvanized steel pipe. Generally, steel pipes made of galvanized steel

S355MC straight seam steel pipe, as a high-strength low-alloy structural steel material, has wide applications in the industrial field. This steel pipe, with its excellent mechanical properties, good weldability, and formability, has become one of the preferred materials in construction, machinery m

Q345E cold-drawn seamless steel pipe is a high-quality steel widely used in the petroleum, chemical, power, boiler, and machinery manufacturing industries. As a low-alloy high-strength structural steel, its excellent mechanical properties and processing characteristics make it an indispensable key m

Q420E cold-drawn seamless steel pipe is a high-strength, low-alloy structural steel material. Due to its excellent mechanical properties and processing characteristics, it is widely used in construction, machinery, energy, and other fields. As a steel pipe processed with a special technique, Q420

First, Material Definition and Standard Origin of 25MnG High-Pressure Boiler Steel Tubes. SA-210C (25MnG) is a seamless carbon-manganese steel tube in the ASME SA-210 standard, specifically designed for boilers and superheaters, belonging to pearlitic heat-resistant steel. In 1995, my country adopt

First, Dimensional Characteristics of DN219 Steel Pipe DN219 steel pipe is a steel pipe with a diameter of 219 mm. In international standards, DN stands for "Specification of Steel Pipe Diameter," and 219 indicates a diameter of 219 mm. The diameter of a steel pipe is crucial for different

Carbon steel pipes and seamless steel pipes are two common types of pipes in the steel industry, and they differ in manufacturing processes and performance characteristics. First, the definition and manufacturing process of carbon steel pipes and seamless steel pipes: Carbon steel pipes are stee

Q690GJE straight seam steel pipe, as a high-strength, low-alloy structural steel pipe, has demonstrated significant advantages in heavy-duty fields such as bridge construction, engineering machinery, and offshore platforms in recent years. This steel achieves a perfect balance between strength and t

Seamless steel pipes, as an important metallic material, are widely used in industrial and construction fields. To ensure the quality and safety of seamless steel pipes, various countries have formulated corresponding standards and specifications to regulate their production and use. 1. Internati

First, Material Characteristics of Q355B Large-Diameter, Thick-Walled Square and Rectangular Steel Pipes Q355B, a low-alloy, high-strength structural steel, is named after its "Q" (yield point), "355" (meaning the steel has a yield strength of at least 355 MPa), and "B" (quality grade), sig

First, the Production Process of Longitudinal Welded Steel Pipes. The production process of longitudinally welded steel pipes primarily includes forming, welding, sizing, and finishing. First, the steel strip is uncoiled and leveled before entering a forming machine for continuous bending t

Stainless steel pipes are gradually replacing traditional pipe materials in building water supply and drainage systems. In the past, cast iron pipes and galvanized steel pipes were common choices, but they were prone to rust and corrosion, which not only affected water quality but also shortened

Stainless steel welded pipe, a common engineering material, has seen increasing use in mechanical equipment manufacturing in recent years. Its unique physical and chemical properties make it a preferred material in many industrial fields. The corrosion resistance of stainless steel welded pipe is

With the continuous advancement of urbanization, the demand for high-quality, high-strength steel in modern construction is increasing. As a key material in the construction industry, steel pipe plays a crucial role in structural design and load-bearing capacity. Among the many steel pipe specificat