www.swivalve.comCopyright 2008 SWI Valve Co., Ltd. All rights reserved.

Post WeldHeat Treatment

PROCEDURE MANUAL

ISO 9001 : 2000 EDITION

HEAT TREATMENT PROCEDURE HEAT TREATMENT PROCEDURE

ISSUE JUN 13, 2003

REVISION DEC 20, 2003

REV. NO. A

PERFORM DEC 20, 2003

DOC. NO. SW-HTP-01

PREPARED BY T. M. LEE

REVIEWED & APPROVED BY

Y. P. CHO

SWI Valve Co.,Ltd.

HEAD OFFICE & PLANT 1023-2, Kwanyang-dong, Anyang, Kyungki-do, Korea Tel : 82-31-422-7495 7 Fax : 82-31-422-7498 Home page : www.swivalve.com

QUALITY ASSURANCE DOC NO. SW-HTP-01 HEAT TREATMENT PROCEDURE PAGE 1 3

1.0 SCOPE 1.1 This procedure defines the heat treatment required by the material specification and

postweld heat treatment(PWHT) of pressure rating parts of the valve of SWI Valve Co.,Ltd.(SWI)

1.2 This procedure shall be applied to the manufacturing process. 2.0 APPLICABLE SPECIFICATIONS STANDARDS & CODES 2.1 ASME B31.3 "CHEMICAL PLANT AND PETROLEUM REFINERY PIPING" 2.2 Applicable material Specification. (ASTM) 3.0 HEAT TREATMENT & POSTWELDED HEAT TREATMENT(PWHT) PROCEDURE 3.1 Preparation 1) The forging & Cast steel shall be free of the scales, oil, grease, rust and other foreign adherents. 2) Loading 3.2 Heating After loading, temperature and time shall be prepared in according to the rules. 3.3 Holding 3.4 Cooling 4.0 INSPECTION The inspection after heat treatment and PWHT shall be performed on below test. 1) Visual 2) Heating Rate 3) Holding Time

4) Cooling Rate 5) Hardness Test

QUALITY ASSURANCE DOC NO. SW-HTP-01 HEAT TREATMENT PROCEDURE PAGE 2 3

5.0 GENERAL SKETCH OF HEAT TREATMENT CURVE

FORGING STEEL HEAT TREATMRNT TEMPERATURE STANDARD Method

Material NORMALIZING STRESS RELIEVING / PWHT

ASTM A105 A350-LF2

Temp. 88025

Air Max. Cooling 150/Hr 300 Holding Time : 1 Hr/in

Temp. 65025

Max. Max. 100/Hr 150/Hr 300

Holding Time : 1 Hr/inch

Method Material NORMALIZING TEMPERING / P.W.H.T

ASTM A182-F5 A182-F9

Temp. 98025

Air Max. Cooling 150/Hr 300 Holding Time : 1 Hr/inch

Temp. 73025

Max. Max. 100/Hr 150/Hr 300

Holding Time : 1 Hr/in P.W.H.T Holding Time : 2 Hr

Method Material NORMALIZING TEMPERING / P.W.H.T

ASTM A182-F11 A182-F22

Temp. 93025

Air Max. Cooling 150/Hr 300 Holding Time : 1 Hr/inch

Temp. 73025

Max. Max. 100/Hr 150/Hr 300

Holding Time : 1 Hr/in P.W.H.T Holding Time : 2 Hr

QUALITY ASSURANCE DOC NO. SW-HTP-01 HEAT TREATMENT PROCEDURE PAGE 3 3

FORGING STEEL HEAT TREATMRNT TEMPERATURE STANDARD Method

Material SOLUTION STRESS RELIEVING / PWHT

ASTM A182-F304 A182-F304L A182-F316 A182-F316L A182-F347 A351-CF3 A351-CF3M A351-CF8 A351-CF8C A351-CF8M

Temp. Min. 1040

Water Max. Cooling 150/Hr 300 Holding Time : 1 Hr/inch

Temp. Min. 1040

Water Max. Cooling 150/Hr 300 Holding Time : 1 Hr/inch

Method Material

NORMALIZING STRESS RELIEVING

ASTM A216-WCB A352-LCB

Temp. 91025

Air Max. Cooling 150/Hr 300 Holding Time : 1 Hr/in

Temp. 65025

Max. Max. 100/Hr 150/Hr 300

Holding Time : 1 Hr/inch

Method Material

NORMALIZING TEMPERING/STRESS RELIEVING

ASTM A217-C5 A217-C12 A217-WC6 A217-WC9

Temp. 95025

Air Max. Cooling 150/Hr 300 Holding Time : 1 Hr/inch

Temp. 73025

Max. Max. 100/Hr 150/Hr 300

Holding Time : 1 Hr/in