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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
Upstream Duplex Stainless Steel Requirements
GP 29-01-02
Scope
This Global Practice (GP) covers the minimum requirements for procuring, fabricating, testing, and
inspecting Duplex 22%Cr and Super Duplex 25%Cr Stainless Steels.
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
Table of Contents
1. Required References ............................................................................................ 4
1.1. ASME–American Society of Mechanical Engineers ..................................... 4
1.2. ASTM–American Society for Testing and Materials ..................................... 4
2. Use of this Global Practice................................................................................... 5
2.1. General......................................................................................................... 5
2.2. Material Technical Sheets ............................................................................ 5
2.3. Welding Duplex 22% Cr and Super Duplex 25% Cr SS Technical Sheet..... 5
2.4. Fischer Ferrite Scope Specification .............................................................. 5
3. Duplex 22% Cr Stainless Steel / Technical Sheets............................................. 7
3.1. Technical Sheet: Duplex 22% Cr Stainless Steel Bars and Shapes............ 7
3.2. Technical Sheet: Duplex 22% Cr Stainless Steel Castings ....................... 10
3.3. Technical Sheet: Duplex 22% Cr Stainless Steel Forgings ....................... 13
3.4. Technical Sheet: Duplex 22% Cr Stainless Steel Plate ............................. 16
3.5. Technical Sheet: Duplex 22% Cr Stainless Steel Process Tubing ............ 18
3.6. Technical Sheet: Duplex 22% Cr Stainless Steel Seamless Pipe ............. 21
3.7. Technical Sheet: Duplex 22% Cr Stainless Steel Wrought Fittings ........... 24
3.8. Technical Sheet: Duplex 22% Cr Stainless Steel Welded Pipe................. 27
4. Duplex 25% Cr Stainless Steel / Technical Sheets........................................... 30
4.1. Technical Sheet: Super Duplex 25% Cr Stainless Steel Bars and Shapes30
4.2. Technical Sheet: Super Duplex 25% Cr Stainless Steel Castings............. 33
4.3. Technical Sheet: Super Duplex 25% Cr Stainless Steel Forgings............. 36
4.4. Technical Sheet: Super Duplex 25% Cr Stainless Steel Plate .................. 39
4.5. Technical Sheet: Super Duplex 25% Cr Stainless Steel Process Tubing.. 42
4.6. Technical Sheet: Super Duplex 25% Cr Stainless Steel Seamless Pipe... 45
4.7. Technical Sheet: Super Duplex 25% Cr Stainless Steel Wrought Fittings. 48
4.8. Technical Sheet: Super Duplex 25% Cr Stainless Steel Welded Pipe ...... 51
4.9. Technical Sheet: Super Duplex 25% Cr Stainless Steel Umbilical Tubing 54
5. Welding Duplex 22% Cr and Super Duplex 25% Cr Stainless Steels / Technical Sheet................................................................................................... 57
6. Fischer Ferrite Scope Specification .................................................................. 63
6.1. Introduction................................................................................................. 63
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
6.2. Scope ......................................................................................................... 63
6.3. Equipment .................................................................................................. 63
6.4. Calibration Standards and Blocks............................................................... 63
6.5. Applicability ................................................................................................ 64
6.6. Surface preparation .................................................................................... 64
6.7. Calibration of Equipment ............................................................................ 65
6.8. Ferrite Measurements ................................................................................ 66
6.9. Ferrite Measurement Locations .................................................................. 67
6.10. Evaluations of Results ................................................................................ 68
6.11. Personnel Qualifications............................................................................. 69
Record of Change ....................................................................................................... 70
Attachment: Purpose Codes Definitions.................................................................. 71
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
1. Required References
This Section lists Practices and Standards that are generically referenced and assumed to be a part of this
document. Unless otherwise specified herein, use the latest edition.
1.1. ASME–American Society of Mechanical Engineers
ASME B16.34 Valves - Flanged, Threaded, and Welding End
ASME SEC V BPVC Section V - Nondestructive Examination
ASME SEC VIII D1 BPVC Section VIII - Rules for Construction of Pressure Vessels -
Division 1
1.2. ASTM–American Society for Testing and Materials
ASTM A 182/A 182M Standard Specification for Forged or Rolled Alloy-Steel Pipe Flanges,
Forged Fittings, and Valves and Parts for High-Temperature Service
ASTM A 240/A 240M Standard Specification for Chromium and Chromium-Nickel Stainless
Steel Plate, Sheet, and Strip for Pressure Vessels and for General
Applications
ASTM A 262 Standard Practices for Detecting Susceptibility to Intergranular Attack in
Austenitic Stainless Steels
ASTM A 276 Standard Specification for Stainless Steel Bars and Shapes
ASTM A 370 Standard Test Methods and Definitions for Mechanical Testing of Steel
Products
ASTM A 380 Standard Practice for Cleaning, Descaling, and Passivation of Stainless
Steel Parts, Equipment, and Systems
ASTM A 450/A
450M/A 450M
Standard Specification for General Requirements for Carbon, Ferritic
Alloy, and Austenitic Alloy Steel Tubes
ASTM A 789/A 789M Standard Specification for Seamless and Welded Ferritic/Austenitic
Stainless Steel Tubing for General Service
ASTM A 790/A 790M Standard Specification for Seamless and Welded Ferritic/Austenitic
Stainless Steel Pipe
ASTM A 815/A 815M Standard Specification for Wrought Ferritic, Ferritic/Austenitic, and
Martensitic Stainless Steel Piping Fittings
ASTM A 890/A 890M Standard Specification for Castings, Iron-Chromium-Nickel-
Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for
General Application
ASTM A 928/A 928M Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel
Pipe Electric Fusion Welded with Addition of Filler Metal
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
ASTM A 995/A 995M Standard Specification for Castings, Austenitic-Ferritic (Duplex)
Stainless Steel, for Pressure-Containing Parts
ASTM E 407 Standard Practice for Microetching Metals and Alloys
ASTM E 562 Standard Test Method for Determining Volume Fraction by Systematic
Manual Point Count
ASTM G 48 Standard Test Methods for Pitting and Crevice Corrosion Resistance of
Stainless Steels and Related Alloys by Use of Ferric Chloride Solution
2. Use of this Global Practice
2.1. General
1) This Global Practice was designed to allow the individual Technical Sheets and Sections to be
extracted from this document and submitted with standard material specifications for procurement
and fabrication.
2) The Technical Sheets identify additional material testing requirements deemed necessary by
Company in order for the material to meet its intended service life.
2.2. Material Technical Sheets
1) The individual Technical Sheets shall be used as supplemental requirements to existing material
specifications (e.g., ASTM, ISO, UNS, etc.).
2) The Technical Sheets reflect the additional requirements of Company imposed on the manufacturers
and material suppliers in order to maintain a quality level that is consistent for the material being
supplied.
3) The Technical Sheets shall not be used as stand-alone documents for procuring or fabricating
materials or components.
2.3. Welding Duplex 22% Cr and Super Duplex 25% Cr SS Technical Sheet
1) The Welding Technical Sheet shall be used as supplemental requirements to existing welding
qualification codes, standards, and specifications.
2) The Welding Technical Sheet shall become an integral part of the Technical Sheets when submitted
to manufacturers or suppliers for material or components that require fabrication by welding.
3) The Welding Technical Sheet shall not be used as a stand-alone document for welding qualifications.
2.4. Fischer Ferrite Scope Specification
1) This Section of the GP is intended to be used for nondestructive measurements of ferrite content in
Duplex Stainless Steels using a Fischer ferrite scope model MP30.
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
2) This Section shall be used and become an integral part of the Technical Sheets whenever the
Technical Sheets indicate a Nondestructive Ferrite Measurement is required.
3) This Section shall also be used when any Duplex or Super Duplex materials are fabricated by
welding.
4) This Section shall be used in conjunction with Company specifications for the individual duplex
products.
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
3. Duplex 22% Cr Stainless Steel / Technical Sheets
3.1. Technical Sheet: Duplex 22% Cr Stainless Steel Bars and Shapes
Technical Sheet 3.1: Duplex 22% Cr Stainless Steel Bars and Shapes
Product Form Bars and Shapes (including, but not limited to, rounds, hexagonals, angles,
tees, etc.)
Material 22% Chromium Ferritic/Austenitic Stainless Steel, often referred to as Duplex
Stainless Steel.
Scope This material Technical sheet is intended to supplement existing material
standards and specifications (e.g., ASTM, ISO, UNS, etc.,) and project
specifications for duplex stainless steel bar products and rolled shapes. The
requirements specified on this Technical sheet are in addition to the
requirements established by the governing standard. In case of conflict
between this standard and the governing standard, the more stringent
requirement(s) shall apply. This Technical sheet is not intended to serve as a
stand-alone document.
Manufacturer
Approval
Materials supplied in accordance to this specification shall only be supplied by
Company approved manufacturers.
Specification ASTM A 276
Grade(s) UNS S31803
Manufacturing
Process
Electric arc or electric furnace and refined by AOD or equivalent process.
Heat Treatment All material shall be delivered in the solution annealed followed by water
quench condition.
Pitting Resistance
Equivalent
Pitting Resistance Equivalent (PRE) = Cr + 3.3Mo + 16N. The PRE shall be
greater than or equal to 34.0
Hardness Per ASTM standard. If no hardness required by ASTM standard, maximum
shall be HRC 28, HB 271, or HV 290
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Technical Sheet 3.1: Duplex 22% Cr Stainless Steel Bars and Shapes
-- Charpy V-notch (ASTM A 370)
-- Not applicable when the maximum obtainable Charpy specimen has a
width along the notch of less than 2.5 mm.
-- Absorbed energy shall be 48J average and 36J single value minimum.
-- Test temperature shall be minus 46°C.
-- Specimens shall be oriented transverse to the rolling direction.
Impact Testing
-- When product shape or dimensions prevent the use of transverse
specimens, then longitudinal specimens may be used.
ASTM E 562
-- Ferrite content shall be determined by manual point count at locations near
the surface of the shape and at mid-thickness
-- Samples shall be electrolytically etched in either NaOH or KOH, and in
such a manner as to provide optimum contrast for austenite and ferrite
phase discrimination
-- Point count shall be conducted at a minimum of 500X magnification
-- A minimum of 30 fields and 16 points per field shall be used
Ferrite Content
-- Ferrite content shall be between 35% - 55%
-- Metallographic examination shall be conducted on samples taken from
near the surface of the shape and from mid-thickness.
-- Samples shall be etched using ASTM E 407 etchant number 98
(K3Fe(CN)4 with KOH or NaOH)
-- Etching shall be performed in such a manner as to provide optimum
resolution of potential precipitates
-- Examination shall be conducted at a minimum of 500X magnification.
Metallographic
Examination
-- Intermetallic phases or precipitates are allowed up to a max. of 0.05
percent.
Extent of Testing All testing shall be conducted on each heat, size, shape configuration, and heat
treatment lot.
Repair of Defects Weld repairs are not allowed
Surface Finish White Pickled
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GP 29-01-02 Upstream Duplex Stainless Steel Requirements August 2003
Technical Sheet 3.1: Duplex 22% Cr Stainless Steel Bars and Shapes
-- Product shall be handled, shipped and stored in such a manner as to
prevent or minimize the possibility of free iron contamination
-- Product shall not be handled with bare steel hooks, chains or lifting forks
without the use of protective insulating material
-- Only stainless steel wire brushes, designated for use only on stainless steel
products, may be used for brushing and descaling
-- Suspected free iron contamination, such as evidenced by unusual stains or
discoloration, shall be verified by ferroxyl testing in accordance with the
procedures outlined in ASTM A 380
Handling,
Shipment, and
Storage
-- Free iron contaminated areas shall be cleaned and passivated, at the
manufacturer’s expense, using the procedures outlined in ASTM A 380
Certification EN 10204 - 3.1B
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3.2. Technical Sheet: Duplex 22% Cr Stainless Steel Castings
Technical Sheet 3.2: Duplex 22% Cr Stainless Steel Castings
Product Form Castings (for valve bodies, pump housings, fittings, and misc. machinery
components, etc.)
Material 22% Chromium Ferritic/Austenitic Stainless Steel, often referred to as Duplex
Stainless Steel.
Scope This material Technical sheet is intended to supplement existing material
standards and specifications (e.g., ASTM, ISO, UNS, etc.,) and project
specifications for duplex stainless steel castings. The requirements specified on
this Technical sheet are in addition to the requirements established by the
governing standard. In case of conflict between this standard and the governing
standard, the more stringent requirement(s) shall apply. This Technical sheet is
not intended to serve as a stand alone document.
Manufacturer
Approval
Materials supplied in accordance to this specification shall only be supplied by
Company approved manufacturers.
Specification ASTM A 890/A 890M, ASTM A 995/A 995M
Grade(s) 4A (UNS J92205)
Supplemental
requirements
S2, S3, S33
Manufacturing
Process
Electric arc or electric furnace and refined by AOD or equivalent process.
Heat Treatment All material shall be delivered in the solution annealed (followed by water
quench) condition.
Pitting Resistance
Equivalent
Pitting Resistance Equivalent (PRE) = Cr + 3.3Mo + 16N. The PRE shall be
greater than or equal to 34.0
Hardness Per ASTM standard. If no hardness required by ASTM standard, maximum
shall be HRC 28, HB 271, or HV 290.
-- Charpy V-notch (ASTM A 370)
-- Not applicable when the maximum obtainable Charpy specimen has a
width along the notch of less than 2.5 mm.
-- Absorbed energy shall be 48J average and 36J single value minimum.
Impact Testing
-- Test temperature shall be minus 46°C.
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