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Hot rolled high strength low alloy steel strip for structure


With preferable comprehensive properties and low temperature toughness, it is suitable for bridge construction, hoisting machinery manufacturing, vehicle and building structure.

Classification:

Keyword:

Hot rolled high strength low alloy steel strip for structure

Details Introduction

1. Application and Features

With preferable comprehensive properties and low temperature toughness, it is suitable for bridge construction, hoisting machinery manufacturing, vehicle and building structure.

2. Grades and Standards

Grades :Q345A/B/C/D, Q420A/B/C/D, Q460C/D, Q500C/D, Q550C/D, Q620C/D, Q690 C/D

Standard :GB/T1591

3. Technical Delivery Conditions

Product specifications

Thickness: 1.2-12.7(mm)

Width: 850-1650(mm)

Delivery conditions

Delivered in hot rolled state.

4. Chemical Composition (Cast analysis) wt%

Grades

C

Mn

Si

S

P

Als

Q345A

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.010

Q345B

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.015

Q345C

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.015

Q345D

≤1.80

≤1.70

≤0.50

≤0.020

≤0.020

≥0.015

Q390A

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.010

Q390B

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.015

Q390C

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.015

Q390D

≤0.20

≤1.70

≤0.50

≤0.020

≤0.020

≥0.015

Q420A

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.010

Q420B

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.015

Q420C

≤0.20

≤1.70

≤0.50

≤0.020

≤0.025

≥0.015

Q420D

≤0.20

≤1.70

≤0.50

≤0.020

≤0.020

≥0.015

Q460C

≤0.20

≤1.80

≤0.60

≤0.020

≤0.025

≥0.015

Q460D

≤0.20

≤1.80

≤0.60

≤0.020

≤0.020

≥0.015

Q500C

≤0.20

≤1.80

≤0.60

≤0.020

≤0.025

≥0.015

Q500D

≤0.18

≤1.80

≤0.60

≤0.020

≤0.020

≥0.015

Q550C

≤0.18

≤2.00

≤0.60

≤0.020

≤0.025

≥0.015

Q550D

≤0.18

≤2.00

≤0.60

≤0.020

≤0.020

≥0.015

Q620C

≤0.18

≤2.00

≤0.60

≤0.020

≤0.025

≥0.015

Q620D

≤0.18

≤2.00

≤0.60

≤0.020

≤0.020

≥0.015

Q690C

≤0.18

≤2.00

≤0.60

≤0.020

≤0.025

≥0.015

Q690D

≤0.18

≤2.00

≤0.60

≤0.020

≤0.020

≥0.015

5. Mechanical properties

Grades

R eL /MPa

R m /MPa

A  %

Bending Test 180°b=2amm

Bend Mandrel Diameter

Impact Test (V type notch)

Temperature℃

Impact Absorbed

Energy/J

Q345A

≥345

470-630

≥20

2a

-

-

Q345B

≥345

470-630

≥20

2a

+20

 

Q345C

≥345

470-630

≥21

2a

0

≥34

Q345D

≥345

470-630

≥21

2a

-20

 

Q390A

≥390

490-650

≥20

2a

-

-

Q390B

≥390

490-650

≥20

2a

+20

 

Q390C

≥390

490-650

≥20

2a

0

≥34

Q390D

≥390

490-650

≥20

2a

-20

 

Q420A

≥420

520-680

≥19

2a

-

-

Q420B

≥420

520-680

≥19

2a

+20

 

Q420C

≥420

520-680

≥19

2a

0

≥34

Q420D

≥420

520-680

≥19

2a

-20

 

Q460C

≥460

550-720

≥17

2a

0

 

Q460D

≥460

550-720

≥17

2a

-20

 

Q500C

≥500

610-770

≥17

2a

0

≥55

Q500D

≥500

610-770

≥17

2a

-20

≥47

Q550C

≥550

670-830

≥16

2a

0

≥55

Q550D

≥550

670-830

≥16

2a

-20

≥47

Q620C

≥620

710-880

≥15

2a

0

≥55

Q620D

≥620

710-880

≥15

2a

-20

≥47

Q690C

≥690

770-940

≥14

2a

0

≥55

Q690D

≥690

770-940

≥14

2a

-20

≥47

Remark

 

1. a=sample thickness (mm), b=sample width (mm), d=bend mandrel diameter (mm).

2. Take Rp 0.2 in case of indistinct yielding.

3.Impact test only valid for strips with the thickness not less than 6mm.

 

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