We Super Steel Manufacturing Co.,Ltd(SMC) are amongst the top manufacturers and suppliers for the seamless steel pipe, welded steel pipe, OCTG products and fittings from China. We have been manufacturing and supplying these products to the industry since 1993, and received repeat orders and appreciation from our valued customers.
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Always up to date. In this column you can find the steel pipe related articles, including industry trends, product standards and materials, and some technical guidelines.
Straight seam steel pipes are widely recognized for their low production costs and availability in various sizes, making them ideal for transporting low-pressure flow gases such as water, steam, and natural gas. However, when purchasing straight seam steel pipes, many buyers are unaware of the key factors to consider and how to avoid potential pitfalls. To help with this, here are three important tips for judging the quality of straight seam steel pipe products from an experienced carbon steel pipe manufacturer.
1. Measuring the Thickness of Straight Seam Steel Pipes
Straight seam steel pipes encompass various categories, including high-frequency welded pipes (ERW steel pipes) and submerged arc welded pipes (LSAW steel pipes). With advancements in manufacturing technology, steel pipe production processes have become increasingly sophisticated. Today, the wall thickness of straight seam steel pipes is growing and can even replace certain stainless steel pipes.
When the required wall thickness of a straight seam steel pipe is 10mm, there can be slight variations in the actual thickness, such as 10.2mm or 9.75mm, which are within normal tolerances. However, some manufacturers may attempt to make substandard pipes appear thicker by using a hammer to flatten the ends, which distorts the appearance. To avoid this, use instruments to measure the pipe thickness when purchasing straight seam steel pipes to check for such discrepancies.
2. Judging the Quality of Straight Seam Steel Pipes
a. Uniformity of Material: Inferior straight seam steel pipes often contain excessive impurities and uneven materials, resulting in low steel density and significant size and weight deviations. High-quality straight seam steel pipes, on the other hand, are made from premium materials with uniform composition, and feature smooth, clean-cut surfaces.
b. Strength Standards: Low-quality straight seam steel pipes are prone to cracking or bending under stress, whereas high-quality pipes exhibit greater strength, resist damage more effectively, and have a longer service life.
c. Specification and Weight Accuracy: Inferior straight seam steel pipes may have size discrepancies and weight inconsistencies due to manufacturing issues or human error. High-quality pipes, however, have minimal deviation in specifications, meet weight standards, and conform to industry requirements.
3. Factory Inspection of Straight Seam Steel Pipes
Before leaving the factory, straight seam steel pipes undergo rigorous testing. If any of these tests do not meet the established standards, the unqualified pipes are removed from the batch, and a re-inspection is conducted on double the number of samples from the same batch. If the re-inspection fails to meet the required standards, the entire batch will be rejected, and the order will not be shipped.
Summary:
Choosing a high-quality straight seam steel pipe from the many available manufacturers can be challenging. Start by determining your specifications, size requirements, and intended application for the steel pipe to ensure you select the most suitable option. Additionally, learn about the qualifications and reputation of the steel pipe manufacturers you are considering. It’s always a good idea to visit the factory directly to ensure the manufacturing standards meet your expectations.
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