+86-400-1866-598 cs@chinasteelmarket.com +86-18864881658 (Whatsapp&Wechat)
Login | Register
Empowering small and medium-scale steel purchasing
Quickly obtain FOB/CIF price
Home > Feature pages

Feature pages

  • 29/03/2024

    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.

    Read More

  • 01/03/2024

    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.

    Read More

  • 29/01/2024

    FEATURE|Common Stainless Steel Types References

    Common stainless steel classifications include martensitic steel, ferritic steel, austenitic steel, duplex stainless steel, etc. There are many different stainless steel models under each classification. This article lists the model names of various stainless steel materials.

    Read More

  • 29/12/2023

    FEATURE| Common Stainless Steel Surface Processing (Treatment) Technologies

    The stainless steel surface treatment process plays an important role in the manufacturing of stainless steel products, and it has a significant impact on the appearance, corrosion resistance, mechanical properties, and service life of the product.

    Read More

  • 30/11/2023

    FEATURE| Common Metal Surface Processing Technologies

    In this article, CSMC will focus on seven surface treatment technologies. At the same time, CSMC will use pictures and text to illustrate these seven surface treatment processes. We hope this will be helpful to our customers.

    Read More

  • 27/10/2023

    FEATURE|Coating Color Reference for Prepainted Steel Plates--RAL Color Card

    In this article, CSMC marks the colors of pre-painted steel plates commonly used in the steel trade according to the different coating materials on the surface of the pre-coated steel plates, hoping to help to customers.

    Read More

  • 28/09/2023

    FEATURE|Chinese and English Comparison of Names of Large Steel Factory in China

    ​In this article, CSMC will focus on several famous steel mills, such as Beijing Shougang, Shanghai Baosteel, and Hebei Jingye. At the same time, CSMC will organize the names of large steel mills in China and match their Chinese names and abbreviations with their English abbreviations for customers' reference.

    Read More

Short News
02/09 17:14
< On September 2, there was not much fluctuation in the price of welded steel pipe in Guangzhou. Q235 (ASTM A36 Gr.D) Zhenhong DN150 (6"*4.5mm) 533.40, down 2.85. (USD/ton)
Read More
02/09 17:13
< On September 2, the price of I-beam in Dalian fell slightly. Q235B (ASTM A36) Baode 40# (400×142×10.5) mm 464.80, down 2.80. (USD/ton)
02/09 17:12
< On September 2, the price of cold-rolled steel plate in Foshan fell slightly. SPCC (ASTM A1008 CS) Liugang 2.0*1500*3000mm 557.20, down 2.80. (USD/ton)
02/09 17:10
< On September 2, the price of bridge steel plate in Anyang rose slightly. Q420qD (ASTM A709 Grade 50) Angang 10mm 728.00, up 7.00. (USD/ton)
Read More
02/09 17:08
< On September 2, the price of galvalume steel sheet & coil in Shanghai remained stable. AZM150 (ASTM A792/A792M CS) Yehui 0.8*1100*C 728.00. (USD/ton)
02/09 17:07
< On September 2, the price of hot rolled patterned coil in Wuxi fell slightly. H-Q235B (ASTM A36) Shagang 9.5*1500*C 490.00, down 4.20. (USD/ton)
Read More

Answers

  • What are Q235R and Q345R?

    Q245R and Q345R are two commonly used pressure vessel steel plate materials. The "R" in the designation stands for "vessel," and the number indicates the yield strength grade.

    Yield Strength:
    Q235R has a yield strength of approximately 235 MPa, while Q345R has a yield strength of up to 345 MPa. This means that under the same external force, Q345R is more resistant to deformation and offers greater structural safety.

    Chemical Composition:
    Q235R has a relatively high carbon content, while its manganese content is within a certain range. Q345R, on the other hand, has a lower carbon content and stricter control over impurities such as phosphorus and sulfur. This allows Q345R to maintain good strength while also exhibiting superior ductility, toughness, and weldability.

    Q235R typically has a temperature limit of around 400°C, making it suitable for low- to medium-temperature and pressure environments. Q345R, on the other hand, boasts increased strength and thermal stability due to the addition of trace alloying elements, allowing for safe long-term use below 450°C. Both steels are widely used in petrochemical, boiler, and storage tank equipment, and the selection process should consider both operating temperature and pressure requirements.


  • What is the difference between Q235B and Q235D?

    Both Q235D and Q235B are carbon structural steels. Ordinary carbon structural steel plate is a type of steel.
    The "Q" represents the yield strength of the material, and the "235" at the end refers to the yield value of the material, which is approximately 235 MPa.

    Chemical Composition
    Q235B: C ≤ 0.20; Mn ≤ 1.40; Si ≤ 0.35; S ≤ 0.045; P ≤ 0.045.
    Q235D: C ≤ 0.17; Mn ≤ 1.40; Si ≤ 0.35; S ≤ 0.035; P ≤ 0.035.

    Low-Temperature Impact Toughness
    Q235D: -20°C impact toughness test performed.
    Q235B: Room-Temperature (20°C) impact toughness test performed.

    Q235B is suitable for applications where performance requirements are guaranteed at room temperature (20°C), while Q235D requires performance to be maintained at -20°C.

    Strength and Plasticity:
    Both have similar yield strength (≥235 MPa) and tensile strength (375–500 MPa);
    However, due to its pure composition and rigorous manufacturing process, Q235D exhibits superior plasticity and low-temperature stability.


  • What are the various coating types for hot-dip galvanizing?

    Hot-dip pure zinc (Z)
    In the hot-dip pure zinc process, the zinc content in the molten pool must be no less than 99%. Pure zinc coatings can produce spangles of varying sizes. While these spangles affect the surface appearance, they do not affect corrosion resistance.

    Hot-dip galvanized aluminum (ZA)
    The molten metal in the molten pool contains approximately 5% aluminum (Al) and a small amount of rare earth elements, with the remainder being zinc. Zn-Al coatings have a brighter surface and offer greater corrosion resistance than pure zinc coatings, but are less commonly used in China.

    Hot-dip aluminum silicon (AS)
    The molten metal in the molten pool contains approximately 8% to 11% silicon (Si), with the remainder being aluminum. Al-Si coatings form a distinct aluminum-iron-silicon alloy layer on the steel surface. They offer excellent high-temperature resistance, making them suitable for high-temperature processing and operating environments. Hot-dip Al-Si coated steel sheets and strip are a type of "aluminum-coated sheet" referred to in the trade.

    Hot-dip galvanized magnesium (ZM) coatings, also known as zinc-aluminum-magnesium (ZAM), consist of a molten metal pool composed of aluminum and magnesium, typically 1.5-8% combined (at least 0.2% magnesium is required), with the remainder being zinc. This coating offers exceptionally good overall corrosion resistance, particularly for shear fracture protection.


Timely Info Independent Platform Multiple guarantees Self-operated storage

China Steel Market

Empowering small and medium-scale steel purchasing


How can I help you?