Visual Inspection

 

This is the most fundamental inspection method. Inspectors directly observe the surface of the steel coil with the naked eye to check for obvious defects such as scratches, pits, bulges, cracks, folds, and scale. For example, scratches may be caused by equipment friction during the production process or collisions during transportation; pits may be due to the impact of foreign objects on the steel surface; scale is formed by the oxidation of the steel surface during the hot - rolling process. If the scale is too thick or uneven, it may affect subsequent processing and use.

 

Dimensional Measurement

 

Precise measurement of the external dimensions of the steel coil is carried out, including the width, thickness, and length of the steel coil. The width and length can be measured using tools such as a steel tape measure, and the thickness is usually measured using a caliper or a specialized thickness - measuring instrument. During the measurement process, it is necessary to ensure that the selected measurement points are representative and to determine whether the dimensions meet the tolerance range according to relevant standards or customer requirements. For example, for steel coils used in some high - precision applications, the thickness tolerance may be very strict, perhaps allowing only a deviation within ±0.05mm.

 

 

 

 

 

 

High Strength Chemical Composition
Grade	C	Si	Mn	P	S
DNV steel	0.18	0.10-0.35	0.9-1.6	0.035	0.035

 

 

Non - Destructive Testing Methods

 

Ultrasonic Testing (UT)

 

The principle is to utilize the propagation characteristics of ultrasonic waves inside the steel coil material to detect internal defects. When ultrasonic waves encounter internal defects such as pores, inclusions, and delamination, they will be reflected, refracted, and scattered. By placing a probe on the surface of the steel coil, emitting ultrasonic waves and receiving the reflected signals, the position, size, and nature of the defects are determined according to the changes in the signals. This method can detect tiny defects at deeper positions inside the steel coil and does not damage the material. For example, for a relatively thick steel coil, internal defects can be effectively detected by adjusting the frequency of the ultrasonic waves and the type of probe.

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our A537CL2 Boiler Steel Plate Hot Rolled Steel Coil, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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