Mechanical properties GB standards

Mechanical properties come in different grades of materials with yield strength ranging from 325 Mpa to 600 Mpa at varying ranges of thickness. They also have tensile strengths ranging 470Mpa to 900Mpa for different grades and thickness.  

Mechanical Properties

Materials

Grade

Yield Strength (Mpa)

Tensile Strength (Mpa)

≤16mm

16mm

40mm

40mm

63mm

≤40mm

40mm

63mm

63mm

80mm

80mm

100mm



Q345

Grade A

345

335

325


470  630


470630


470630


470630

Grade B

Grade C

Grade D

Grade E



Q390

Grade A

390

370

350


490650


490650


490650


490650

Grade B

Grade C

Grade D

Grade E



Q420

Grade A

420

400

380


520680


520680


520680


520680

Grade B

Grade C

Grade D

Grade E


Q460

Grade C

460

440

420


550720


550720


550720


550720

Grade D

Grade E


Q500

Grade C

500

480

470


610770


600760


590750


540730

Grade D

Grade E


Q550

Grade C

550

530

520


670830


620810


600790


590780

Grade D

Grade E


Q620

Grade C

620

600

590


710880


690880


670860


_

Grade D

Grade E


Q690

Grade C

690

670

660


770940


750920


730900


_

Grade D

Grade E





For elongation of  materials, standards come in  decreasing  percentage of material strength  for increasing size of material grades and these also come in  varying  material thickness too. Below is a table of mechanical properties 
   

Materials

Grade

Elongation

A%

≤40mm

40mm63mm

63mm100mm

Q345

Grade A

20

19

19

Grade B

Grade C

21

20

20

Grade D

Grade E

Q390

Grade A

20

19

19

Grade B

Grade C

Grade D

Grade E

Q420

Grade A

19

18

18

Grade B

Grade C

Grade D

Grade E

Q460

Grade C

17

16

16

Grade D

Grade E

Q500

Grade C

17

17

17

Grade D

Grade E

Q550

Grade C

16

16

16

Grade D

Grade E

Q620

Grade C

15

15

15

Grade D

Grade E

Q690

Grade C

14

14

14

Grade D

Grade E




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