Please find the following references;

1. API

(1) API 941; Steels in Hydrogen Services at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants, 1998 Ed.
(2) API RP 934-2000; Materials and Fabrication Requirements for 2 1/4Cr-1Mo and 3Cr-1Mo Steel Heavy Wall Pressure Vessels for High Temperature, High Pressure Hydrogen Service, 2000 Ed
(3) API RP 934-2006 or 2007; Materials and Fabrication Requirements for 2 1/4Cr-1Mo, enhanced 2 1/4Cr-1Mo, 2 1/4Cr-1Mo-1/4V, 3Cr-1Mo and 3Cr-1Mo-1/4V Steel Heavy Wall Pressure Vessels for High Temperature, High Pressure Hydrogen Service (On revising)
(4) API Publ. 959; Characterization Study of Temper Embrittlement of Chromium-Molybdenum Steels, 1982
(5) API Publ. 938; Experimental Study of Causes and Repair of Cracking of 1 1/4Cr- 1/2Mo Steel Equipment, 1996
(6) API RP xxx- 2006 or 2007 (?) ; Materials and Fabrication Requirements for 1 1/4Cr-1/2Mo Steel Heavy Wall (2inch</ thickness </4inch) Pressure Vessels for High Temperature, High Pressure Hydrogen Service
(7) API Technical Bulletin 938B, Use of 9Cr-1Mo-V (Grade 91) Steel in the Oil Refinery Industry, 2006 (?)
(8) API RP 920; Prevention of Brittle Fracture of Pressure Vessels, 1990

(9) API RP 571; DAmage Mechanism Affecting Fixed Equipment in the REfinery Industry, 2003
(10) API RP 579; Fitness For Service, 2000
(11) API Publ. 581 RBI, 2000

2. WRC (Bulletin)

(1) WRC-275; The Use of Quenched and Tempered 2 1/4Cr-1Mo steel for Thick Wall Reactor Vessels in Petroleum Refinery Process: An Interpretative Review of 25 years of Research and Application, 1982 Ed.
(2) WRC-390 Failure of Welds at Elevated Temperatures by G.R. Stevick, March 1994 (39 pp)
(3) WRC-405 Effect of Heat Treatment on the Elevated Temperature Properties of a 2 1/4Cr-1Mo Submerged Arc Weldment, by C.D. Lundin and K.K. Khan. September 1995 (45 pp)
(4) WRC-407 Reports on Heat Treatment of Steels Used in Boiler and Pressure Vessel Applications: (1) Carbon Migration in Cr-Mo Weldments Effect on Metallurgical Structure and Mechanical Properties, by C.D. Lundin, K.K. Khan and D. Yang and (2) ASME Post-Weld Heat Treating Practices: An Interpretive Report, by C.E. Spaeder, Jr. and W.D. Doty, December 1995 (65 pp)
(5) WRC-409 Fundamental Studies of the Metallurgical Causes and Mitigation of Reheat Cracking in 1 1/4Cr-1/2Mo and 2 1/2Cr-1Mo Steels, by C.D. Lundin and K.K. Khan, February 1996 (117 pp)
(6) WRC-411 An Experimental Study of Causes and Repair of Cracking of 1 1/4Cr-1/2Mo Steel Equipment, by C.D. Lundin, P. Liu, C.Y.P. Qiao, G. Zhou, K.K. Khan and M. Prager, May 1996 (215 pp)
(7) WRC-412 Challenges and Solutions in Repair Welding for Power and Processing Plants, Proceedings of a Workshop, June 1996 (125 pp)
(8) WRC-416 Creep Crack Growth Behavior in Weld Metal/Base Metal/Fusion Zone Regions in Chromium Molybdenum Steels, by R.H. Norris and A. Saxena, November 1996 (61 pp)
(9) WRC-439 Use of Low Carbon 1-1/4 Cr-Mo Weld Metal for Fabrication of Cr-Mo Components, by C.D. Lundin, P. Liu, G. Zhou and K. Kahn - February 1999 (99 pp) -
(10) WRC-454, A Literature Review on Characteristics of High Temperature Ferritic Cr-Mo Steels and Weldments by Carl D. Lundin, Peng Liu, Yan Cui - August 2000. Library of Congress Card Catalog: 85-647116 (36 pages)
(11) WRC-499, Wang, Y., Lundin, C. D., Qiao, C. Y. P., Khan, K. K., Al-Ejel, K., Batten, G. W., Repair of Cr-Mo Steels

3. ASME

(1) ASME Section VIII, Div.1, Mandatory Appendix 31 - Rules for Cr-Mo Steels with Additional Requirements for Welding and Heat Treatment
(2) ASME Section VIII, Div.2, Mandatory Appendix 26 - Rules for Cr-Mo Steels with Additional Requirements for Welding and Heat Treatment
(3) ASME Code Case 2098-2 (1995) about 2 1/4Cr-1Mo-1/4V
(4) ASME Code Case2151-1 (1997) about 3 Cr-1Mo-1/4V-Cb-Ca
(5) ASME Code 2235 (1996) about Use of UT in lieu of RT
(6) ASME Code 2355-2 (1996) about Use of UT, 3D size of defects
(7) Code Case 1943 Seamless Modified 9Cr-1Mo, ASME Section I, 1983
(8) Code Case 1973 Modified 9Cr-1Mo Material, ASME section VIII, Division 1, 1985
(9) Code Case 1973-2 9Cr-1Mo-V Material, ASME Section VIII, Division 2, 1996
(10) Code Case 2179-3 Seamless 9Cr-2W Material, ASME Section I and Section VIII, Division 1, 1999
(11) Code Case 2327 Normalized and Tempered 9Cr-1Mo-1W-Cb Materials, ASME Section I, 2000

* Please be aware the ASME code cases have the expiration date.

4. AWS

(1) ANSI/AWS D10.8: Recommended Practices for Welding of Cr-Mo Steel Piping and Tubing, 1996
(2) Many Articles in Welding Journal

5. Others

(1) Masashi Nakashiro, Cr-Mo강 耐熱材料의 經年劣化(2.25Cr鋼의 PLANT 재료의 경년열화 및 손상), 配 管 技 術 (일본) 12월 호, 1998
(2) Many Articles in Welding Journals in ASME, NACE, Elsevier Science, Metallurgical and Materials Transactions, Korean Metal Society, KWS, and Company Lab (i.e. TWI, Japan Steel Makers, Euroweld, etc.)

Hope they help,

Thomas J.C. Eun
thomaseun@hanmail.net
(O) 1-780-713-3199

Please find the attachment for ASME materials of Cr-Mo steels.

Thomas

MaterialsGroupinCr-MoSteels.doc

Repair welding Cr-Mo steels (without PWHT)

Please find the following references;

1. WRC Bulletin 412
2. http://www.twi.co.uk/j32k/protected/band_13/power_casenon1.html
3. 1996 API Coke Drum Survey-Final Report
4. ASME Section VIII & IX, temper/half bead welding

thomaseun@hanmail.net - for Korean