Answers

• 
  What is the typical hardness of steel pipes?

  The hardness of steel pipes is one of the important indicators for measuring their quality and performance. The hardness value directly affects the wear resistance, compressive strength, and service life of steel pipes.
  
  The hardness of steel pipes is generally measured by three hardness indices: Brinell, Rockwell, and Vickers. The specific hardness value varies depending on the type of steel and the manufacturing process. These indices are obtained through different testing methods and can comprehensively reflect the hardness characteristics of steel pipes. Generally speaking, the hardness value of steel pipes ranges from 30 to 80.
  Different types of steel pipes, such as casing steel and precision seamless steel pipes, have different hardness values. The hardness of casing steel is usually between 100 and 180, while the hardness of precision seamless steel pipes is between 80 and 120.
  Galvanized steel pipes have advantages in corrosion resistance and relatively high hardness. Typically, the hardness value of galvanized steel pipes is between 70 and 90, which meets the needs of general engineering applications.
  Seamless steel pipe is a common type of steel pipe with a relatively moderate hardness value. Generally speaking, the hardness of seamless steel pipes is between 30 and 50, making them suitable for a variety of engineering fields.

  
  
• 
  We need a small batch of SPCC cold-rolled steel coils for testing. Does your company have any MOQ requirements? If the initial order quantity is small, can you arrange production and shipment? Additionally, could you provide samples for our preliminary testing?

  Hello! We are pleased that you are interested in our SPCC cold-rolled steel coils.
  
  We fully understand and support the testing needs during the new product development phase, and we can flexibly meet your needs for small-batch procurement and sample testing.
  
  We are committed to serving customers of all sizes. For general-purpose materials like SPCC cold-rolled steel coils, we offer highly flexible minimum order quantities. For smaller trial orders, we will also do our best to coordinate production resources to accommodate them.
  
  We can provide you with samples of SPCC cold-rolled steel coils. Simply tell us the specific specifications you need (such as thickness, width, surface finish) and sample dimensions, and we can arrange for it to be shipped to you. You will need to bear the international express shipping cost for the samples. After you confirm the samples and place a formal order, we can deduct the sample shipping cost from your first payment to show our sincerity in cooperating.
  
  Rest assured, even if the order quantity is small, after you confirm the sample and pay the deposit, we will still strictly follow the contract requirements, arrange a formal production process and quality inspection for you, and ensure that the goods are properly packaged and shipped through reliable logistics channels. We guarantee that even small-batch orders will enjoy our standardized quality and service.
  
  In order for us to provide you with the most accurate samples and quotations, please tell us your detailed specifications for SPCC cold-rolled steel coils (e.g., thickness, width, inner diameter of the coil, surface oil film requirements, etc.). Please also provide your mailing address so we can calculate the sample shipping cost.
  
  

  
  
• 
  What are the characteristics of double-sided submerged arc spiral steel pipe?

  High-pressure resistance: Double-sided submerged arc welding has a high deposition rate and deep penetration capability, which can produce high-strength steel pipes to meet the needs of high-pressure fluid transportation.
  Excellent weld quality: The welded area is well protected, the weld is dense, flat, smooth, and of stable quality, meeting a variety of performance requirements.
  Corrosion and low temperature resistance: This steel pipe has good corrosion resistance and low temperature resistance, making it suitable for various complex environments.

  
  

  Double-sided spiral seam submerged arc-welded steel pipes are produced using an automated production line, which can achieve continuous and high-speed welding. This production method not only improves production efficiency but also reduces worker intensity.
  Double-sided spiral submerged arc-welded steel pipe utilizes a submerged arc welding process, which offers advantages such as high welding speed, deep penetration, and high weld quality. At the same time, by welding inside the pipe, the influence of the external environment on the welding quality can be avoided.
  Since double-sided spiral seam submerged arc welded steel pipes use high-strength steel strips as raw materials, they have good mechanical properties such as tensile strength, yield point and elongation, and can meet various engineering needs.
  Double-sided spiral seam submerged arc-welded steel pipes are widely used in various projects, such as bridges, buildings, pipelines, etc. Its excellent performance and good adaptability enable it to maintain a stable working state in various harsh environments.