2022-06-29
Introduction to Anti-Corrosion Steel Pipes
Corrosion-resistant steel pipes include: 3PE-coated steel pipes, cement mortar-coated steel pipes, epoxy powder-coated steel pipes, epoxy-rich zinc paint-coated steel pipes, epoxy coal tar pitch-coated steel pipes, and plastic-coated corrosion-resistant steel pipes, among others.
**Corrosion Protection Standards**
- FBE epoxy powder coating complies with SY/T0315—2005, the "Technical Specification for Single-Layer Fusion Bonded Epoxy Powder External Coating of Steel Pipelines."
- 2PE/3PE corrosion protection follows GB/T23257-2009, the "Technical Standard for Polyethylene External Coating of Buried Steel Pipelines."
- Surface rust removal standards for the anti-corrosion layer specify that the steel pipe's outer surface must undergo sandblasting to achieve Sa2½ grade according to GB/T8923-2008. Additionally, the anchor profile depth on the pipe surface should be maintained between 40 and 100 μm.
**Applications**
The base materials for corrosion-resistant steel pipes include spiral pipes, straight-seam pipes, and seamless pipes, which are widely used in China across various pipeline engineering fields such as long-distance water transmission, oil, chemical industry, natural gas, heating systems, wastewater treatment, water resource projects, bridge construction, steel structure applications, and offshore marine pile driving pipelines.
**Advantages**
In addition to extending the service life of steel pipes, corrosion protection offers several key benefits:
1. Combines the mechanical strength of steel with the excellent corrosion resistance of plastics, providing superior durability.
2. Features an external coating thickness exceeding 2.5 mm, ensuring exceptional resistance to scratches and impacts.
3. Exhibits a low internal friction coefficient ranging from 0.0081 to 0.091, significantly reducing energy consumption.
4. Meets national hygiene standards, ensuring safe and clean internal surfaces.
5. The smooth inner walls resist scaling and fouling, offering self-cleaning capabilities for optimal performance.
2022-06-29
Avoiding splicing at the r-point of the dish-shaped tube cap can prevent thinning and high stress.
Stainless Steel Grades: 304, 304L, 316, 316L, 321, 2520, 310, 317, and more.
Nominal Diameters: DN15 to DN1200
Wall Thicknesses: SCH5 to SCH160
Standards: ASME, DIN, JIS, BS, GB/T, JB, SH, HG—specifically including: GB/T 12459-2017, GB/T 13401-2017, ASME B16.9, SH3408, SH3409, HG/T 21635, DL/T 695, SY/T 0510, DIN 2617.
Applications: Water, beverages, beer, food processing, petrochemicals, nuclear power, machinery, medical equipment, fertilizers, shipbuilding, waterproofing systems, piping, and more.
Packaging: Wooden crates or cardboard boxes.
When applying dish-end caps, avoid splicing at the radius area, as this can lead to material thinning and high stress concentrations.
During splicing, weld seams must be oriented either radially or circumferentially—this requirement may eventually be relaxed for larger-cap diameter applications. Additionally, there are specific spacing guidelines for splices: they should be positioned at least 3δ away from each other, with a minimum distance of 100 mm. (The weld heat-affected zone is inherently a region of high stress, and chemical composition loss occurs within this area. Therefore, it’s crucial to steer clear of these high-stress zones, as their extent depends on the material thickness. Based on practical experience, the recommended stress-relief length is greater than 3δ but no less than 100 mm.) However, this requirement is particularly challenging to meet in refrigeration equipment due to their unique design characteristics.
2022-06-08
What standards should be followed for 304 stainless steel elbows?
As a critical component in piping systems, the 304 stainless steel elbow must be manufactured and used in compliance with multi-dimensional international and domestic standard systems.
Daily Knowledge: Construction Notes for Stamped Elbows.
As a high-performance pipe connection component, the stamped elbow has become one of the most widely used types of elbows in modern industrial applications, thanks to its outstanding advantages such as structural stability, strong pressure resistance, and versatile compatibility.
08
2022/06
Key considerations when processing and handling 90° seamless high-pressure elbows
Laser quenching technology for high-pressure elbows is an advanced metal surface treatment technique, with its core principle lying in the rapid heating of steel surfaces using a focused, high-energy laser beam.
08
2022/06
An alloy steel SO-welded flange with a raised face—its literal meaning clearly conveys that it’s a flat-welded flange made from alloy steel material, often simply referred to as a flange plate.
08
2022/06
The stamping elbow manufacturer provided a detailed self-introduction.
Hello everyone, before introducing ourselves as "Stamping Elbows," let’s first understand what an elbow actually is. Elbows are everywhere in our daily lives—though we may not always realize it. In piping systems, elbows are essential fittings that help change the direction of pipelines.
08
2022/06