Surface quenching and tempering heat treatment for straight seam steel pipes is typically performed using induction heating or flame heating. The main technical parameters are surface hardness, localized hardness, and effective hardened layer depth. Hardness testing of straight seam steel pipes can

First, what are the steelmaking steps for S355J2H seamless steel pipe? (1) Raw material selection and proportioning: The production of S355J2H seamless steel pipe begins with the careful selection of raw materials. The main raw materials are molten iron and scrap steel. Molten iron generally comes

1. Introduction  During welding of stainless steel pipes in petrochemical construction, the weld surface and heat-affected zone are prone to oxidation and discoloration. To ensure the corrosion resistance of stainless steel, pickling and passivation treatment are performed on the weld after we

First, what are the material properties of DIN2391/94c precision hydraulic seamless steel pipes? 1) Standards and Grades of Precision Hydraulic Seamless Steel Pipes DIN2391: German seamless steel pipe standard, covering various steel grades (such as St37, St45, St52, etc.). 94c: May refer to a sp

First, clearly define the tolerance marking datum for precision steel pipes. The core premise of tolerance marking is a clear datum. If the datum is missing or ambiguous, it will lead to misunderstandings of precision requirements between the supplier and the buyer. Common pitfalls include: not mar

First, what are the causes of deformation in thin-walled stainless steel seamless pipe fittings?  The core causes of deformation in thin-walled stainless steel seamless pipe fittings stem from material characteristics, uneven stress, temperature changes, and insufficient process adaptability.

Spiral steel pipe, as an important steel product, is widely used in petroleum, natural gas, water conservancy, power, and manufacturing industries. Among them, Q345 spiral steel pipe has attracted much attention due to its excellent performance and diverse applications. Q345 spiral steel pipe is a s

1. Straight seam steel pipes can be measured using a grating ruler. (1) The basic principle of measuring straight seam steel pipes using a grating ruler is as follows: Two fixed-length grating rulers are installed on the outer sides of both ends of the straight seam steel pipe. A rodless cylinder i

Seamless steel pipes are an indispensable member of the steel industry. Seamless steel pipes are divided into two types: hot-rolled and cold-rolled, each with unique production processes and performance characteristics. Hot-rolled seamless steel pipes are manufactured through a hot-rolling proces

Steel pipes, as indispensable materials in construction, machinery manufacturing, and other fields, bear important functions and responsibilities. 30Mn2 seamless steel pipe is one such example, and its quality, characteristics, and application areas deserve in-depth understanding and discussion.

1. Examine the surface of the spiral steel pipe to assess its manufacturing process. Generally, analysis of the spiral steel is necessary. Inferior spiral steel pipes often have an elliptical cross-section. This is because manufacturers save on raw materials, resulting in slightly larger reductions

NS1402 seamless steel pipes, a shining example in the field of high-end alloy materials, play an indispensable role in various industries such as industrial manufacturing, chemical engineering, oil and gas extraction, and marine engineering due to their unique properties and wide range of applicatio

As a high-performance metallic material, 07Cr18Ni11Nb heat-resistant stainless steel pipe plays a vital role in modern industry. It not only possesses excellent corrosion resistance and heat resistance, but also demonstrates broad application prospects in multiple fields due to its unique compositio

According to current installation techniques for buried firefighting steel pipes, three construction methods are generally required: ordinary grade epoxy coal tar pitch with a thickness greater than 0.3mm, reinforced grade with a thickness greater than 0.6mm, and extra-reinforced grade with a thickn

1. Cleaning the surface of the anti-corrosion spiral steel pipe using solvents or emulsions can remove organic matter, but it cannot remove rust, scale, welding flux, etc., so cleaning can only be used as an auxiliary method. 2. Grinding the surface of the anti-corrosion spiral steel pipe using t

First, the Principle of Anti-corrosion Steel Pipes Coating anti-corrosion is a uniform, dense coating formed on the surface of rust-free metal steel pipes, which isolates them from various corrosive media. Steel pipe anti-corrosion coatings increasingly utilize composite materials or composite stru

1. During the spiral steel pipe forming process, the steel plate deforms uniformly, has low residual stress, and does not produce scratches on the surface. The processed steel pipes offer greater flexibility in terms of diameter and wall thickness for spiral welded steel pipes, especially in the pro

Oil casing can be broadly classified according to its application into: 1. Surface casing; 2. Intermediate casing; 3. Production casing; 4. Drilling casing. Surface casing primarily serves to suspend and support subsequent casing layers via a casing head installed at the top. It also isolates shallo