Cement mortar coating should generally be applied after the spiral welded steel pipe has been laid, pressure tested, and backfilled and compacted according to the design requirements. This is because spiral welded steel pipes have low rigidity and thin walls, and must be kept stable during coating a

First, what are the differences between anti-corrosion steel pipes and galvanized steel pipes?  Although both are pipe materials, they differ in material, manufacturing process, anti-corrosion performance, and application scenarios. 1. Material differences: Anti-corrosion steel pipes are made

"Large-diameter straight seam welded steel pipe" is a general term referring to steel pipes produced using steel strips and welded straight seams on high-frequency welding equipment. Different subsequent production processes are involved depending on the intended use. Generally, straight seam ste

Cold-drawn steel pipes are widely used in machinery manufacturing, automotive parts, hydraulic systems, and other fields due to their high precision and good surface quality. However, incorrect specification selection can easily lead to problems such as inability to assemble and substandard performa

HSC seamless steel pipe, resistant to wet hydrogen sulfide stress corrosion, is a type of seamless steel pipe with specific corrosion resistance properties. This type of pipe is mainly used in applications requiring resistance to wet hydrogen sulfide stress corrosion, such as in the petroleum, chemi

(1) During extrusion, the temperature of the inner lining of the spiral welded steel pipe continuously increases with the progress of the extrusion process. At the end of extrusion, the temperature in the area near the extrusion die on the inner wall of the lining is relatively high, reaching 631℃.

The nominal diameter of a straight seam steel pipe refers to the series of diameter dimensions specified in the straight seam steel pipe standard. For straight seam steel pipes, fittings, valves, etc., the nominal diameter is expressed using the series specified in the standard. Straight seam steel

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 corrosion prevention measures for oil casing? 1. We ensure water quality meets standards; we strictly monitor and manage water quality. 1. Implement separate injection for clean and contaminated water, strengthen the cleaning of the main water pipeline, ensure that the water qua

1.API 5CT Standard OCTG Casing & Tubing Leading Grades & Specifications API 5CT J55 / K55 / N80: Economical and reliable grades for a wide range of well depths and pressures. Ideal for standard drilling environments. Higher-Grade Options: Including

First, what is a thin-walled spiral welded steel pipe?  The strip steel is fed into a pipe welding unit and rolled by multiple rollers, gradually forming a circular pipe blank with an open gap. The pressure of the extrusion rollers is adjusted to control the weld gap to 1-3mm, ensuring the two

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

In the production process of cold-drawn steel pipes, the "annealing" step—commonly known as "heating"—is not a superfluous process, but a crucial operation that determines the final performance and subsequent reliability of the cold-drawn steel pipe. To understand why this "heating" is necessary, we

First, what is the process flow for welding steel pipes?  Installation preparation - grooving - hole drilling - machinery installation - tees/crosses - steel pipe installation - system pressure testing. Second, what are the preparation steps for welding steel pipe installation? 1. Inspect

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

15CrMoG alloy steel pipe is a seamless steel pipe with the properties of a high-pressure alloy pipe. Its core properties include high-temperature strength, oxidation resistance, hydrogen corrosion resistance, and suitability for fluid transportation under high-pressure environments. First, what a

Plastic-coated steel pipes, also known as plastic-coated pipes, steel-plastic composite pipes, or plastic-coated composite steel pipes, are steel-plastic composite pipes with a steel pipe base. A layer of plastic anti-corrosion coating is fused to the inner surface of the steel pipe or to both the i