Q235A spiral steel pipe

　　Material: Q235A

　　Standard: GB / T 700-2006

Q235A Overview

　　Features and Scope:

　　Q235A toughness and ductility is good, there is a certain degree of elongation, and having a good weldability and hot workability. Q235A general use in hot-rolled state, rolling steel, steel bars, steel sheets, steel pipes can be used to manufacture welded structure, bridges and generally unimportant machine parts, such as bolts, rod, rivets, collar and even rod and so on.

Representation:

　　① Q + Digital + Quality rating symbols + deoxy method symbol. Of steel No. dubbed "Q" on behalf of the steel yield point behind the numbers indicate the yield point value, units of MPa example, the yield point (σs) of 235 MPa, carbon structural steel Q235.

　　② necessary, after the spiral pipe steel grade symbol mark indicates the quality level and method of deoxidation. Quality rating symbols is respectively A, B, C, D. Deoxidation method symbols: F boiling steel; b represents a semi-killed steel: Z represents killed steel; TZ special killed steel, killed steel may from time to standard symbol Z and TZ can not marked. For example, the Q235-AF Class A boiling steel.

　　(3) special purpose carbon steel , bridge steel,spiral steel

Physical properties

　　Chemical Composition

　　Carbon C: ≤ 0.22%

　　Silicon Si: ≤ 0.35%

　　Manganese Mn: ≤ 1.4%

　　Sulfur S: ≤ 0.050%

　　Phosphorus P: ≤ 0.045%

　　Chromium Cr: to allow the residual content ≤ 0.030%

　　Ni: to allow the residual content ≤ 0.030%

　　Cu: to allow the residual content ≤ 0.030%

　　Note: the deoxidation method: F, and Z

　　Mechanical Properties

　　Tensile strength σb (MPa): 370 ~ 500

　　Yield strength σs (MPa): ≤ 16 is: ≥ 235;> 16 to 40: ≥ 225;> from 40 ~~ 60: ≥ 215;> of 60 ~~ 100: ≥ 215;> 100 to 150 is: ≥ 195; > 150: ≥ 185

　　Elongation δ5 (%): ≤ 40: ≥ 26;> from 40 ~~ 60: ≥ 25;> of 60 ~~ 100: ≥ 24;> 100 to 150 is: ≥ 22;> the 150 ~~ 200: ≥ 21 ;

　　Cold bending (bending 180 °): 【thickness of longitudinal】 steel ≤ 16, the apex diameter d = a; steel thickness> 16 to 100, the apex diameter d = 2a;

　　[Lateral] steel thickness ≤ 16, the apex diameter d = 1.5a; steel thickness> 16 to 100, the apex diameter d = 2.5a;

　　Heat treatment and microstructure specifications

　　Heat treatment specifications: hot-rolled.

　　Microstructure: ferrite + pearlite.

　　Delivery status:

　　Generally hot-rolled (including controlled rolling) state Delivery. According to the requirements of the demand side, by mutual agreement, normalizing the state of delivery.

The difference between Q235A and Q235B

　　Q235A and Q235B distinction: steel are the carbon steel. Do not do impact Q235A material in the national standards GB / T 700-2006, Q235A and Q235B material distinction primarily carbon content of the steel, the material is Q235A material carbon content is usually in the range of 0.14-0.22%; experiments Q235B done at room temperature impact test, the V-notch. In consultation with customers, Q235B carbon content can also be production shipments of ≤ 0.22%.

　　Relatively speaking, the material is Q235B steel mechanical properties far superior to the material is Q235A steel. In the general case, the steel mills in the factory before the finished profiles signage done logo. Discriminant signage material Q235A, Q235B, or other material. Gauge pressure P ≤ 1.6MPa; use temperature of 0 to 350 ℃; plate thickness> = 20mm

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