ASTM A815/ ASME SA815 Specification for Wrought Ferritic Ferritic/Austenitic Stainless Steel Piping Fittings

Wrought Stainless Steel Butt Weld & Piping Fittings | Technical Specification PDF Download

The ASTM A815 / ASME SA815 Specification PDF provides a comprehensive technical reference for wrought ferritic and ferritic/austenitic (duplex) stainless steel piping fittings. This standard covers material grades, chemical composition, mechanical properties, manufacturing requirements, dimensions, tolerances, testing, and inspection for stainless steel fittings used in pressure piping systems and corrosive service environments.

Class WP fittings are subdivided into four subclasses: Classes WP-S, WP-W, WP-WX, and WP-WU. They are manufactured to the requirements of Specification A960/A960M, and they shall have pressure ratings compatible with 13.2.

Class WP-S fittings are those manufactured from seamless product by a seamless method of manufacture (marked with class symbol WP-S).
Class WP-W fittings are those which contain welds where the fitting fabrication or construction welds have been radiographed (marked with class symbol WP-W).
Class WP-WX fittings are those which contain welds where all welds have been radiographed (marked with class symbol WP-WX).
Class WP-WU fittings are those which contain welds where all welds have been ultrasonically tested (marked with class symbol WP-WU).

ASTM A815 & ASME SA815

ASTM A815 is the standard specification for wrought ferritic, ferritic/austenitic (duplex), and martensitic stainless steel piping fittings intended for pressure and corrosive service.

ASME SA815 is the ASME-adopted equivalent of ASTM A815 and is commonly specified for projects designed in accordance with the ASME Boiler and Pressure Vessel Code (BPVC).

Both standards are technically equivalent in material and performance requirements.

Scope of ASTM A815 / ASME SA815

This specification applies to wrought stainless steel fittings, including butt-welding and other pressure piping fittings, manufactured from:

Ferritic Stainless Steel
Ferritic/Austenitic (Duplex) Stainless Steel

The fittings are intended for use in high-pressure, high-temperature, and corrosive service conditions.

Common Material Grades Covered

ASTM A815 / ASME SA815 includes a wide range of stainless steel grades, such as:

Ferritic Stainless Steel Grades

UNS S41000
UNS S43000

Duplex Stainless Steel Grades

UNS S31803 / S32205 – Duplex 2205
UNS S32750 – Super Duplex 2507
UNS S32760 – Super Duplex Zeron 100
Other duplex grades as specified

Grade designation is typically expressed as WP + UNS Number (e.g., WP S31803).

Product Forms

ASTM A815 / ASME SA815 fittings are commonly supplied as:

Elbows (45°, 90°, 180° – LR / SR)
Tees (Equal & Reducing)
Reducers (Concentric & Eccentric)
Caps
Stub Ends
Custom Fabricated Piping Fittings

Dimensional standards often referenced include ASME B16.9, ASME B16.28, and MSS SP-43.

Chemical Composition

UNS	Type	C max %	Cr %	Ni %	Mo %	N %	Mn max %	Si max %
S41000	Ferritic	0.15	11.5–13.5	≤0.5	—	—	1	1
S43000	Ferritic	0.12	16.0–18.0	≤0.5	—	—	1	1
S31803	Duplex	0.03	21.0–23.0	4.5–6.5	2.5–3.5	0.08–0.20	2	1
S32205	Duplex	0.03	22.0–23.0	4.5–6.5	3.0–3.5	0.14–0.20	2	1
S32750	Super Duplex	0.03	24.0–26.0	6.0–8.0	3.0–5.0	0.24–0.32	1.2	0.8
S32760	Super Duplex	0.03	24.0–26.0	6.0–8.0	3.0–4.0	0.20–0.30	1	1

Mechanical Properties

Mechanical property requirements depend on the material grade and heat treatment condition, typically including:

Tensile strength
Yield strength
Elongation
Impact testing (when specified)

Duplex grades offer higher strength compared to standard austenitic stainless steels.

UNS	Type	Solution / Heat Treatment Temperature (°C)	Cooling Method	Tempering
S41000	Ferritic	≥650	As appropriate / air	Not specified
S43000	Ferritic	≥650	As appropriate	Not specified
S31803	Duplex	1020–1100	Water quench or rapid cool	Not required
S32205	Duplex	1020–1100	Water quench	Not required
S32750	Super Duplex	1025–1125	Water quench or rapid cool	Not required
S32760	Super Duplex	1100–1140	Water quench or rapid cool	Not required

UNS	Type	Yield Strength min (MPa)	Tensile Strength (MPa)	Elongation min %	Hardness HB max
S41000	Ferritic	205	485–655	20	207
S43000	Ferritic	240	450–620	20	190
S31803	Duplex	450	620	20	290
S32205	Duplex	450	655	20	290
S32750	Super Duplex	550	800–965	15	310
S32760	Super Duplex	550	750–895	25	270

Manufacturing Requirements

ASTM A815 / ASME SA815 fittings are manufactured by:

Hot forming or cold forming
Solution annealing or heat treatment as required by grade
Pickling and passivation
Final machining and dimensional inspection

All fittings must conform to the applicable dimensional and quality requirements of the standard.

Dimensions & Tolerances

Fittings dimensions are governed by applicable standards such as ASME B16.9, ASME B16.28, or MSS SP-43, depending on fitting type and size.

Dimensional controls include:

End-to-end dimensions
Wall thickness
Outside diameter and fit-up
Bevel and end preparation

Testing & Inspection

Each ASTM A815 / ASME SA815 fitting may be subjected to:

Chemical analysis
Mechanical testing
Non-destructive testing (NDT)
Dimensional inspection
Visual examination

Mill Test Certificates (EN 10204 3.1) are typically supplied.

Applications

Oil & Gas Pipelines
Petrochemical & Chemical Processing
Offshore & Marine Systems
Power Generation
Pressure Piping Systems
Desalination Plants

ASTM A815 / ASME SA815 fittings are widely used where corrosion resistance and high strength are required.

Download ASTM A815 / ASME SA815 Specification PDF

Click below to download the complete ASTM A815 / ASME SA815 Specification for Wrought Ferritic & Ferritic/Austenitic Stainless Steel Piping Fittings PDF, including full grade tables, dimensional references, and testing requirements.

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