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  • 2024-08-28 00:00:00.0

    FEATURE|The Analysis of the Impact of China's New Rebar Standard-GB 1499.2-2024

    On June 25, 2024, China announced the new national standard for rebar -GB 1499.2-2024 (after this referred to as the new national standard) and announced that the policy would be officially implemented on September 25, with a buffer period of 3 months.

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  • 2024-07-29 00:00:00.0

    FEATURE| The Knowledge Summary of Seamless, Welded Steel Pipes, Stainless Steel Pipes, and Special-shaped Steel Pipes

    A steel pipe is a steel material with a hollow section whose length is much greater than its diameter or circumference. Steel pipes have the advantages of high strength and durability, and those pipes are easy to cut, weld, and form.

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  • 2024-06-28 00:00:00.0

    FEATURE| Analysis of the Difference Between Galvanized Steel Sheet and Galvalume Steel Sheet & Plate

    Galvanized steel sheet & plate and galvalume steel sheet & plate are two common anti-corrosion steel plates widely used in construction, automobiles, home appliances, and other fields. The two products have similarities and differences.

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  • 2024-06-04 00:00:00.0

    FEATURE|A New Fashion in the Field of House Construction, Colored Stone Metal Tile

    Stone-coated metal roofing tile not only has the natural, deep, and excellent decorative properties of traditional clay tile but also has the light, strong, and durable performance of modern metal tile. It is the main trend in the development of international advanced roofing materials.

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  • 2024-04-30 00:00:00.0

    FEATURE|Comparison of Common Mold Steel Grades in China and Other Countries

    Mold steel is a type of steel used to make molds, such as cold stamping dies, hot forging dies, and die-casting dies. Molds are the main processing tools for manufacturing parts in industrial sectors such as machinery manufacturing, radio instruments, motors, and electrical appliances. Since the production standards of various countries are different, this has caused certain difficulties for customers in international trade. CSMC will organize and display the Chinese grades and other countries' grades to help customers conduct trade more smoothly.

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  • 2024-03-29 00:00:00.0

    FEATURE|The Brief Summary of Common Container Knowledge

    Container refers to a large loading container with a certain strength, stiffness, and specifications specially designed for turnover use. The characteristics of containers are that they have a uniform format and can be stacked layer by layer. Therefore, they can be placed in large numbers on ocean-going ships. It can provide manufacturers around the world with high-volume shipping services that are cheaper than air freight.

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  • 2024-03-01 00:00:00.0

    FEATURE|The Shipping Company Indispensable in International Trade

    In short, shipping companies help facilitate the smooth flow of international trade by providing comprehensive cargo transportation services. They play a key role in global supply chains, facilitating the flow of cross-border goods and supporting the globalized economy.

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Short News
2024-09-14 17:17:46.0
< On September 14, the price of the hot rolled pickled coil in Rizhao rose slightly. SPHC (A1011 CS Type B) Rizhao Steel 2.5*1250*C 513.24, up 1.41. (USD/ton)
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2024-09-14 17:16:24.0
< On September 14, the price of scaffolding steel pipe in Tangshan remained stable. Q235 (ASTM A36 Gr.D) Haiya 48*2.75*900 (horizontal pipe) 635.91. (USD/ton)
2024-09-14 17:14:29.0
< On September 14, the price of 300 series cold-rolled stainless steel coil in Foshan remained stable. 304/2B TISCO 0.8*1219*C (slit edge) 2030.40. (USD/ton)
2024-09-14 17:13:06.0
< On September 14, the price of the prestressed steel strand in Beijing remained stable. 2230MPa Baoweisen Φ21.8 (retard-bonded, high strength) 3013.17. (USD/ton)
2024-09-14 16:42:53.0
< On September 14, the price of zinc-aluminum-magnesium steel coil has remained stable in Foshan. 2.0*1250*C mm 671.04 (USD/ton)
2024-09-14 16:42:39.0
< On September 14, the price of galvalume steel sheet & coil has remained stable in Shanghai. 1.5*1250*C mm 788.05 (USD/ton)

Answers

  • What is the standard for the porosity of welded joints?

    According to national and industry standards, the porosity of welded joints should generally not exceed 3%. If the porosity exceeds 3%, the mechanical properties and corrosion resistance of the welded joint will be affected, resulting in fatigue fracture and damage to the weld. Therefore, when conducting welding quality inspections, the porosity of welded joints needs to be strictly controlled to ensure that it meets the standard requirements.


  • What causes excessive residual austenite?

    1. Improper quenching temperature
    The quenching temperature has a very important influence on the structure of steel parts. Too low or too high a quenching temperature will lead to the presence of residual austenite in the quenched steel. The too-low quenching temperature will lead to the incomplete transformation of martensite, while the too-high quenching temperature will lead to the re-precipitation of austenite.
    2. During the quenching process, the martensite that has been transformed first hinders the transformation of the untransformed austenite to martensite.


  • Is square tube welding four-sided welding or only two-sided welding?

    Square tube welding can be performed on four sides or only on two sides. These two methods are called four-sided welding and two-sided welding respectively.

    Two-sided welding: When the welding quality is not high, just lay the pipe and the parts connecting the pipe flat on the ground and use a handheld arc welding machine to perform meat welding. After welding, the weld cannot be seen, the appearance is not worse than butt welding, and the reliability is also OK. It is suitable for some pipe connections and installations with low-quality requirements, such as some outdoor iron art, etc.

    Four-sided welding: For some square tube welding situations that require higher strength or better appearance, skilled welders should use four-sided welding, that is, all four sides except the bottom are welded. It is suitable for some industries, ships, and other buildings that require higher strength. At the same time, the appearance of four-sided welding is better and more beautiful.


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