Chemical Composition
The chemical composition of each cast or furnace steel shall be determined and shall comply with the chemical
Heat treatment
For H grade steel, separate solution heat treatment are required for solution annealing. All pipe fittings should be supplied in heat treated condition. All welding work should be done before heat treatment. Fitting that have been machined directly from solution annealed forgings and bar stocks do not need to be annealed again.
ASTM A403 Standard Scope
The standard includes several grades of austenitic stainless steel alloys, and uses the WP or CR prefix to mark the grade of steel, depending on the applicable ASTM or MSS size and rated pressure standards.
ASTM A403 is designed for forged steel pipe fittings, Cast pipe fittings are not suitable. (Austenitic stainless steel castings are included in these standard, A351/A351M, A743/A743M and A744/A744M.)
composition requirements for each grade of material listed in the chemical composition table.
Tensile Properties
The tensile properties of the pipe fitting materials shall comply
with the tensile properties requirements. Tests and reports shall
be conducted in accordance with A370 methods and definitions.
For tensile testing, longitudinal or transverse cut specimens
should be acceptable. Although tensile properties Table specifies
the elongation requirements for the longitudinal and transverse
specimens, it is not intended to be applicable at the same time.
Instead, This intent that only the corresponding elongation
requirements for specimens that are applicable in the direction are
appropriate.
WP Grade Stainless Steel Pipe Fittings
Material under this standard named as WP Grade, and for each WP grade stainless steel, several categories of pipe fittings are included, to indicate that a seamless or welded structure is used. Class designations are also used to indicate non-destructive testing methods and the extent of non-destructive testing (NDE).
Tensile Properties
The tensile properties of the pipe fitting materials shall comply
with the tensile properties requirements. Tests and reports shall
be conducted in accordance with A370 methods and definitions.
For tensile testing, longitudinal or transverse cut specimens
should be acceptable. Although tensile properties Table specifies
the elongation requirements for the longitudinal and transverse
specimens, it is not intended to be applicable at the same time.
Instead, This intent that only the corresponding elongation
requirements for specimens that are applicable in the direction are
appropriate.
ASTM A403 Stainless Steel Pipe Fittings
ASTM A403 Stainless Steel Pipe Fittings refers to the material of forged and rolled austenitic stainless fittings for pressure pipes. Common grades are WP304/L, WP316/L. They can be used into many fields as engineering industry, energy conversion plants etc.
Tensile test report made on the starting material shall notes:
• The starting material report shall demonstrate that the
properties of the pipe fittings material meet the requirements of
this standard, provided that the heat treatment of the initial
material is the same as that of the pipe fittings material.
• If the initial material has not been tested, or if the heat
treatment of the initial material is different from that of the
pipe fittings, the fitting manufacturer shall conduct at least one
tensile test per furnace steel on the material representing of the
finished pipe fittings, and the heat treatment condition shall be
the same as that of the pipe fittings represented.
Tensile Properties
The tensile properties of the pipe fitting materials shall comply
with the tensile properties requirements. Tests and reports shall
be conducted in accordance with A370 methods and definitions.
For tensile testing, longitudinal or transverse cut specimens
should be acceptable. Although tensile properties Table specifies
the elongation requirements for the longitudinal and transverse
specimens, it is not intended to be applicable at the same time.
Instead, This intent that only the corresponding elongation
requirements for specimens that are applicable in the direction are
appropriate.
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
Abstract
This specification covers the standard for wrought austenitic stainless steel fittings for pressure piping applications. The material for fittings shall consist of forgings, bars, plates, or seamless or welded tubular products. Forging or shaping operations shall be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining, or by a combination of two or more of these operations. All fittings shall undergo heat-treatment. Chemical and product analyses shall be performed and shall conform to the required chemical composition in carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and titanium. Tension test shall be done on the fitting material to determine the tensile properties such as yield strength and tensile strength. Fittings supplied under this specification shall be examined visually for surface discontinuities, surface checks, and mechanical marks.
1. Scope
1.1 This specification covers wrought stainless steel fittings for pressure piping applications.2
1.2 Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.
1.3 For each of the WP stainless grades, several classes of fittings are covered, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.
1.4 This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.6 This specification does not apply to cast steel fittings. Austenitic stainless steel castings are covered in Specifications A351/A351M, A743/A743M, and A744/A744M.
| A403 WP316 Lateral Tee | ASTM A403 WP316 Equal Tee |
| ASTM A403 WP316 Stainless Steel Equal Tee | A403 Gr WP316 Lateral Tee |
| Grade WP316 Stainless Steel Lateral Tee | Stainless Steel 316 Equal Tee |
| ASME SA403 316 Stainless Steel Equal Tee | ASTM A403 WP316 Stainless Steel Lateral Tee |
| ASME SA403M Stainless Steel 316 Lateral Tee | Stainless Steel Grade WP316 Equal Tee |
| WP316 Stainless Steel Equal Tee | ASME SA 403 WP316 Lateral Tee |
| ASTM A403 WP316 Stub End | |
|---|---|
| WP316 ASTM A403 Long Stub End | ASTM A403 WP316 Stainless Steel Short Stub End |
| ASTM A403 Stainless Steel 316 Short Stub End | Grade WP316 Stainless Steel Long Stub End |
| Stainless Steel WP316 Long Stub End | ASME SA403 316 Stainless Steel Short Stub End |
| Stainless Steel ASTM A403 WP316 Short Stub End | ASME SA403M Stainless Steel 316 Long Stub End |
| Stainless Steel UNS S30403 Long Stub End | WP316 Stainless Steel Short Stub End |
| ASTM A403 WP316 Short Stub End | ASTM A403 Grade WP316 Long Stub End |
| ASME SA403 Stainless Steel 316 Long Stub End | ASME SA403M Stainless Steel WP 316 Short Stub End |
| Stainless Steel 316 Short Stub End | Werkstoff No 1.4307 Stainless Steel Long Stub End |
| ASTM A403 Stainless Steel WP316 Long Stub End | ANSI B16.9 Stainless Steel 316 Short Stub End |
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