Heat treatment system of GB/T 5310-2017 standard steel pipe

 

Grade

Heat treatment system

20Ga

Normalizing: normalizing temperature 880℃~940℃

20MnGa

Normalizing: normalizing temperature 880℃~940℃

25MnGa

Normalizing: normalizing temperature 880℃~940℃

15MoGb

Normalizing: normalizing temperature 890℃~950℃

20MoGb

Normalizing: normalizing temperature 890℃~950℃

12GrMoGb

Normalizing + tempering: normalizing temperature 900℃~960℃, tempering temperature 670℃~730℃

15GrMoGb

Steel pipes with S≤30mm are normalized and tempered: normalizing temperature is 900℃~960℃; tempering temperature is 680℃~730℃.
S>30mm steel pipe quenching plus tempering or normalizing plus tempering: quenching temperature is not less than 900 ℃, tempering temperature 680℃～750℃; normalizing temperature 900℃～960℃, tempering temperature 680℃ ~730℃, but should be cooled quickly after normalizing.

12Cr2MoGb

Steel pipes with S≤30mm are normalized and tempered: normalizing temperature is 900℃~960℃; tempering temperature is 700℃~750℃.
S>30mm steel pipe quenching plus tempering or normalizing plus tempering: quenching temperature is not less than 900 ℃, tempering temperature 700℃～750℃; normalizing temperature 900℃～960℃, tempering temperature 700℃ ~750℃, but should be cooled quickly after normalizing.

12Cr1MoVGb

Steel pipes with S≤30mm are normalized and tempered: normalizing temperature is 980℃~1020℃; tempering temperature is 7200℃~760℃.
S>30mm steel pipe quenching plus tempering or normalizing plus tempering: quenching temperature is 950℃～990℃, tempering temperature 720℃～760℃; normalizing temperature 980℃～1020℃, tempering temperature 720℃ ~760℃, but should be cooled quickly after normalizing.

12Cr2MoWVTiB

Normalizing + tempering: normalizing temperature 1020℃~1060℃, tempering temperature 760℃~790℃

07Cr2MoW2VNbB

Normalizing + tempering: normalizing temperature 1040℃~1080℃, tempering temperature 750℃~780℃

12Cr3MoVSiTiB

Normalizing + tempering: normalizing temperature 1040℃~1090℃, tempering temperature 720℃~770℃

15Ni1MnMoNbCu

Steel pipes with S≤30mm are normalized and tempered: normalizing temperature is 880℃~980℃; tempering temperature is 610℃~680℃.
S>30mm steel pipe quenching plus tempering or normalizing plus tempering: quenching temperature is not less than 900℃, tempering temperature 610℃～680℃; normalizing temperature 880 ℃～980℃, tempering temperature 610℃ ~680℃, but should be cooled quickly after normalizing.

10Cr9Mo1VNbN

Normalizing and tempering: normalizing temperature is 1 040℃~1 080℃; tempering temperature is 750℃~780℃. Steel pipes with S>70 mm can be quenched and tempered, and the quenching temperature is not lower than 1040℃. The tempering temperature is 750℃~780℃

10Cr9MoW2VNbCu1BN

Normalizing and tempering: normalizing temperature is 1 040℃~1 080℃; tempering temperature is 760℃~790℃. Steel pipes with S>70 mm can be quenched and tempered, and the quenching temperature is not lower than 1040℃. The tempering temperature is 760℃~790℃

10Cr11MoW2VNbCu1BN

Normalizing and tempering: normalizing temperature is 1 040℃~1 080℃; tempering temperature is 760℃~790℃. Steel pipes with S>70 mm can be quenched and tempered, and the quenching temperature is not lower than 1040℃. The tempering temperature is 760℃~790℃

11CR9Mo1W1VNbBN

Normalizing and tempering: normalizing temperature is 1 040℃~1 080℃; tempering temperature is 750℃~780℃. Steel pipes with S>70 mm can be quenched and tempered, and the quenching temperature is not lower than 1040℃. The tempering temperature is 750℃~780℃

07Cr19Ni10

Solution treatment: solution temperature not lower than 1 040℃, quenching

10Cr18Ni9NbCu3BN

Solution treatment: solution temperature not lower than 1 100℃, quenching

07Cr25Ni21

Solution treatment: solution temperature not lower than 1 040℃, quenching

07Cr25Ni21NbNc

Solution treatment: solution temperature not lower than 1 100℃, quenching

07Cr19Ni11Tic

Solution treatment: The solution temperature of hot-rolled (extrusion, expansion) steel pipe is not lower than 1050℃, and the solution temperature of cold-drawn (rolled) steel pipe is not lower than 1100℃, and it is quenched.

07Cr18Ni11Nbc

Solution treatment: The solution temperature of hot-rolled (extrusion, expansion) steel pipe is not lower than 1050℃, and the solution temperature of cold-drawn (rolled) steel pipe is not lower than 1100℃, and it is quenched.

08Cr18Ni11NbFG

Softening heat treatment before cold working: softening heat treatment temperature should be at least 50°C higher than solution treatment temperature; solution treatment after final cold working: solution temperature not lower than 1180°C, quenching

a  When the final rolling temperature of the hot-rolled (extruded, expanded) steel pipe is within the range from the critical temperature of phase transformation Ar3 to the upper temperature limit specified in the table, and the steel pipe is air-cooled, it should be considered that the steel pipe is normalized.

b  For the hot-expanded steel pipe with D ≥ 457 mm, when the final rolling temperature of the steel pipe is within the range from the critical phase transition temperature Ar3 to the upper temperature limit specified in the table, and the steel pipe is air-cooled, the steel pipe should be considered to be normalized; With the consent of the purchaser and indicated in the contract, online normalizing that complies with the foregoing provisions may be used.

c  According to the requirements of the purchaser, steel pipes with grades of 07Cr25Ni21NbN, 07Cr19Ni11Ti and 07Cr18Ni11Nb can be subjected to stabilization heat treatment at a temperature lower than the initial solution treatment temperature after solution treatment. The temperature of stabilization heat treatment is negotiated by both parties.

From:http://boilersteelpipe.com/pro/smls/heat-treatment-system-of-gb-t-5310-2017-standard-steel-pipe.html

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