First, Q690D straight seam welded steel pipe, Q690D straight seam welded steel pipe, Q690D belongs to low alloy high strength structural steel plate, Q690D straight seam welded steel pipe implementation standard is GB/T1591-2008 special technical conditions. Q690D is a straight seam welded steel pipe that not only has very high strength but also has certain flexibility, wear resistance, fatigue resistance, impact resistance, easy processing, and wear resistance. It is often used in the manufacturing industry, such as mining machinery, cranes, anchors, shield machines, hydraulic supports, port machinery, marine equipment bridge structures, etc.

Second, the Q690D straight seam welded steel pipe has enough high-quality performance.
1. It meets the material selection requirements of many manufacturing industries
2. The high-quality performance status presented during the use process has also been deeply loved and praised by the manufacturing industry. Later, due to social recognition, frequent use in the manufacturing industry, and continuous optimization by manufacturers, Q690D straight seam welded steel pipe has gradually become one of the most commonly used raw materials in the manufacturing industry.
3. Introduction to the chemical composition of Q690D straight seam welded steel pipe
Q= represents the yield point, and is also the abbreviation of the first letter of the Chinese character “Q”
690= represents the strength unit of the steel plate and is also the yield unit. Mpa means that the steel plate can withstand a yield value of 690Mpa. If it exceeds this point, the steel plate will deform and damage.
D= represents the grade of the steel plate.
Q690 is divided into 3 levels, namely
Q690C=0 degree impact test
Q690D=-20 degree low-temperature impact test
Q690E=-40 degree low-temperature impact test

What is the use of a low-temperature impact steel plate?
Answer: Q690D straight seam welded steel pipe, Q690D straight seam welded steel pipe will become brittle in severe cold weather, and the steel plate will deform, damage, or crack when it is hit and vibrated. However, the steel plate that has been subjected to low-temperature impact will still have a certain toughness when it encounters severe cold weather, and the steel plate will maintain its original performance state when it is hit and vibrated.

3. Q690D straight seam welded steel pipe delivery status description
Q690D straight seam welded steel pipe is delivered by normalizing. According to different needs, it can be normalized + tempered, normalized + quenched, sized, controlled, and rolled.
The thickness of Q690D straight seam welded steel pipe can be I probe, II probe, III probe.
The thickness extension of Q690D straight seam welded steel pipe can be Z15, Z25, Z35
What is the use of flaw detection?
Q690D straight seam welded steel pipe, Q690D straight seam welded steel pipe is an industrial machine product. It is impossible to guarantee that every plate is 100% good and 100% defect-free. Thickness flaw detection can detect whether there are sand holes, cracks, pores, etc. in the steel plate. Flaw detection can eliminate some inherent defects of the steel plate. Commonly used in China are national standard I probe, II probe, III probe, German standard three probe, etc.

Different delivery states will present different component performances and uses, so when choosing the delivery state, it is necessary to make unified standards with each other according to the current situation.