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 Naslov: Classification of Q235 carbon structural steel
 Post Postano: 25 kol 2021, 04:45 
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Pridružen/a: 14 srp 2016, 11:19
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Generally, rolled steel mainly includes: wire rod or round steel, square steel, flat steel, angle steel, I-beam, channel steel, window frame steel and other section steel, medium and thick steel plate.
purpose
1. It is widely used in architecture and engineering structures. It is used to make steel bars or build plant room frames, high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc. it is also widely used as mechanical parts with low performance requirements. C. Grade D steel can also be used as some professional steel.
2. It can be used for various mold handles and other unimportant mold parts.Baosteel 2 inch 321 stainless steel pipe
3. Q235 steel is used as punch material. It is used directly without tempering after quenching. The hardness is 36 ~ 40HRC, which solves the phenomenon of punch fragmentation in use.
Representation method
The complete expression method is: Q235 - quality grade symbol · deoxidation method symbol. The quality grade is divided into a, B, C and D. in turn, the quality of Grade A is poor, and the quality of grade D is the highest. The symbols of deoxidation method are f, B, Z and TZ, which respectively represent rimmed steel, semi killed steel, killed steel and special killed steel. However, in the brand representation method, the symbols of Z and TZ can be omitted. Different grades of Q235A, Q235B, Q235C and q235d are mainly represented by different impact temperatures. A refers to no impact, B is above 20 degrees, C is above 0 degrees and D-20 degrees. The difference between a and e refers to the difference in impact temperature in their performance. They are: Q235 class A, which is not required for impact toughness test; Grade Q235B is used for impact toughness test at normal temperature (20 ℃); Grade Q235C is used for 0 ℃ impact toughness test; Grade q235d is used for - 20 ℃ impact toughness test. Charpy V-notch specimens were used for impact toughness test. The impact toughness index is Akv. For the above grade B, C and D steels, Akv ≥ 27j is required under different temperature requirements. At different impact temperatures, the impact values are also different.API 5L X60 seamless steel pipe with gavanized processing
Q235 element content
A. The sulfur contents of B, C and D decreased in turn; The phosphorus content of a and B is the same, the phosphorus content of C is the second, and the phosphorus content of D is the least
Q235 chemical composition
Q235: Grade A, B, C and D (GB / T 700-2006)
Q235 class A contains C ≤ 0.22%, Mn ≤ 1.4%, Si ≤ 0.35%, s ≤ 0.050 and P ≤ 0.045
Grade Q235B contains C ≤ 0.20%, Mn ≤ 1.4%, Si ≤ 0.35%, s ≤ 0.045 and P ≤ 0.045 (with the consent of the demander, the carbon content can not be greater than 0.22%)
Q235C grade, C ≤ 0.17%, Mn ≤ 1.4%, Si ≤ 0.35%, s ≤ 0.040, P ≤ 0.040
Grade q235d, containing C ≤ 0.17%, Mn ≤ 1.4%, Si ≤ 0.35%, s ≤ 0.035 and P ≤ 0.035
Q235 deoxidation method
F, B and Z can be expressed as boiling steel, semi killed steel and killed steel respectively. Grade A and B steels have three deoxidation methods: F, B and Z. grade C steel has only killed steel and grade D steel has only special killed steel. Rimming steel is a steel with incomplete deoxidation, which has poor plasticity and toughness. The welded structure made of this material is easy to crack when subjected to dynamic load. It is not suitable to work at low temperature, and sometimes hardening will occur. In contrast, killed steel has excellent and uniform quality and good plasticity and toughness.4" corrugated flexible tube


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