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.

The hardness of stainless steel pipes refers to the material's ability to resist localized plastic deformation, and is a key indicator for measuring the mechanical properties of materials.

Commonly used hardness indicators: 

1. Brinell hardness (HB): Calculated by the diameter of the indentation formed by pressing an indenter into the surface of the material. It is suitable for softer materials.

2. Rockwell Hardness (HRC): Calculated using a diamond cone indenter and the difference in indentation depth. It is suitable for hard materials such as quenched steel.

3. Vickers hardness (HV): Calculated based on the diagonal length of the diamond indentation, suitable for testing thin layers or small parts.

Heat treatment method:
Annealing treatment can eliminate cold working stress, reduce hardness but improve plasticity.
Quenching increases hardness through rapid cooling, but it must be combined with tempering to avoid brittleness.

The hardness of stainless steel pipes is not necessarily the higher the better. Their suitability needs to be judged comprehensively based on the specific application scenario, performance requirements, and processing technology. Hardness, as a material's ability to resist localized deformation (such as indentation and scratches), is related to indicators such as toughness, ductility, processing performance, and corrosion resistance. Excessive pursuit of hardness may lead to a decline in other key properties, which in turn affects the performance of the material.

Stainless steel pipes can have their hardness increased through cold working (such as cold rolling and cold drawing) or heat treatment (such as quenching), but this will lead to a decrease in plasticity (such as elongation) and toughness (impact resistance).

The cutting, welding, and drilling processes of high-hardness stainless steel pipes are more difficult, requiring specialized equipment (such as high-hardness cutting tools). Furthermore, welding is prone to defects such as hot cracking and reduced joint strength, increasing processing costs and process complexity.

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.