Main location

Shanghai, China

Send email to us by

sales@sunnysteel.com

Know-how and best quality

tel:+8621 3378 0199

ASTM A403 Standard Specification

ASTM A403 Standard specification covers the standard for wrought austenitic stainless steel fittings for pressure piping applications. ASTM A403 / A403M  Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings.

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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

Chemical Composition of ASTM A403 Stainless Steel

Grade UNS
nbsp;
C
strong>(1)
Mn
strong>(1)
P
strong>(1)
S
strong>(1)
Si
strong>(1)
Ni Cr Mo Ti N
strong>(2)
Others
WPXM-19 S20910 0.06 4.0-6.0 0.045 0.030 1.0 11.5-13.5 20.5-23.5 1.50-3.0 0.20-0.40 (3)
WP304 S3040 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
WP304L S30403 0.030
(4)
2.0 0.045 0.030 1.0 8.0-12.0 18.0-20.0
WP304H S30409 0.04-0.10 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
WP304N S30451 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0 0.10-0.16
WP304LN S30453 0.030 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0 0.10-0.16
WP309 S3090 0.20 2.0 0.045 0.030 1.0 12.0-15.0 22.0-24.0
WP310S S3108 0.08 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0
WPS31254 S31254 0.020 1.0 0.030 0.010 0.80 17.5-18.5 19.5-20.5 6.0-6.5 0.18-0.22 Cu0.50-1.0
WP316 S3160 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0
WP316L S31603 0.030 align=”center”(4) 2.0 0.045 0.030 1.0 10.0-14.0
(5)
16.0-18.0 2.0-3.0
WP316H S31609 0.04-0.10 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0 0.10-0.16
WP316N S31651 0.08 2.0 0.045 0.030 1.0 10.0-13.0 16.0-18.0 2.0-3.0 0.10-0.16
WP316LN S31653 0.030 2.0 0.045 0.030 1.0 10.0-13.0 16.0-18.0 2.0-3.0 0.10-0.16
WP317 S3170 0.08 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
WP317L S31703 0.030 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
WPS31725 S31725 0.030 2.0 0.045 0.030 1.0 13.5-17.5 18.0-20.0 4.0-5.0 0.20
WPS31726 S31726 0.030 2.0 0.045 0.030 1.0 13.5-17.5 17.0-20.0 4.0-5.0 0.10-0.20
WPS31727 S31727 0.030 1.0 0.030 0.030 1.0 14.5-16.5 17.5-19.0 3.8-4.5 0.15-0.21 Cu2.8-4.0
WPS32053 S32053 0.030 1.0 0.030 0.010 1.0 24.0-26.0 22.0-24.0 5.0-6.0 0.17-0.22
WP321 S3210 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (6)
WP321H S32109 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (7)
WPS33228 S33228 0.04-0.08 1.0 0.020 0.015 0.30 31.0-33.0 26.0-28.0 Ce 0.05-0.10 Al 0.025Nb 0.6-0.10
WPS34565 S34565 0.030 5.0-
7.0
0.030 0.010 1.0 16.0-18.0 23.0-25.0 4.0-5.0 0.40-0.60 Nb 0.10
WP347 S3470 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (8)
WP347H S34709 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (9)
WP348 S3480 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 Nb+Ta= 103(C)-1.10Ta 0.10Co 0.20
WP348H S34809 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 Nb+Ta= 83(C)-1.10Ta 0.10Co 0.20
WPS38815 S38815 0.030 2.0 0.040 0.020 5.5-
6.5
13.0-17.0 13.0-15.0 0.75-1.50 Cu 0.75-1.50Al 0.30

Notes:

  1. Maximum, if not otherwise indicated.
  2. The method of analysis for Nitrogen is agreed between the purchaser and manufacturer.
  3. Niobium 0.10-0.30%; Vanadium, 0.10-0.30%.
  4. For small diameter or thin walls, a Carbon maximum of 0.040% is mandatory in grades TP304L and TP316L. Small outside diameter tubes are those less than 0.50 in. [12.7 mm] 5) in outside diameter and light wall tubes as those less than 0.049 in. [1.24 mm] in average wall thickness.
  5. On pierced tubing, the Nickel may be 11.0-16.0%.
  6. 5 X (C+N2)-0.70.
  7. 4 X (C+N2) -0.70.
  8. The Niobium % shall be ten times above the Carbon content and not more than 1.10%.
  9. The Niobium % shall be eight times above the Carbon content and not more than 1.10%.
  10. All values are maximum unless otherwise indicated.

Mechanical properties

Tensile and Elongation Requirements WP304, WP316 WP304L, WP316L
Yield Strength, min, ksi [MPa] 30[205] 25[170]
Tensile Strength, min, ksi [MPa] 75[515] 70[485]
Elongation (1) Longitudinal 28 28
Transverse 20 20

General Scope

1.1 This specification covers wrought stainless steel fittings for pressure piping applications.

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.

TABLE 1 Fitting Classes for WP Grades
Class Construction Nondestructive Examination

  • S Seamless None
  • W Welded Radiography or Ultrasonic
  • WX Welded Radiography
  • WU Welded Ultrasonic

Stainless steel butt weld dimensional tolerances ASTM A403 / ASME SA403 – B16.9 – B16.28

(1) Out-of-round is the sum of absolute values of plus and minus tolerance.
(2) The inside diameter at ends and the nominal wall thicknesses are to be specified by the purchaser.
IN ACCORDANCE WITH ASME B16.9 – B16.28
All Fittings 90°and 45° Ells and Tees Reducers and Lap Joint Stub Caps 180° Returns Angularity Tol
Nominal Pipe Plane Size (NPS) Outside(1) Diameter at Bevel Inside(1) Diameter at End Wall(2) Thickness Centre-to- End Dimension A,B,C,M Overall Length L Overall Length E Centre-to- Centre Dimension O Back-to- Face Dimension K Alignment at Ends U Nominal Pipe SIze Off Angle Q Off Angle P
1/2 TO 2-1/2 +1/16 ±1/32 Not less than 87-1/2% of Normal Thickness ±1/16 ±1/16 ±1/8 ±1/4 ±1/4 ±1/32 12 to 4 1/32 1/16
-1/32 5 to 8 1/16 1/8
3 TO 3-1/2 ±1/16 ±1/16 ±1/16 ±1/16 ±1/8 ±1/4 ±1/4 ±1/32 10 to 12 3/32 3/16
4 ±1/16 ±1/16 ±1/16 ±1/16 ±1/8 ±1/4 ±1/4 ±1/32 14 to 16 3/32 1/4
5 TO 8 +1/32 ±1/16 ±1/16 ±1/16 ±1/4 ±1/4 ±1/4 ±1/32 18 to 24 1/8 3/8
-1/16
10 TO 18 +1/16 ±1/8 ±3/32 ±3/32 ±1/4 ±3/8 ±1/4 ±1/16 All dimensions are in inches
-1/8
20 TO 24 +1/4 ±3/32 ±3/32 ±3/32 ±1/4 ±3/8 ±1/4 ±1/16
-3/32

Nominal Wall Thickness
(1)
End Preparation
Less than x* Cut square or slightly
chamfer, at mfr.’s option
x* to
7/8 incl.
Plain bevel as in sketch “a”
More than 7/8” Compound bevel as in
sketch “b”
x* =
3/16” for carbon steel, ferritic alloy steel, or
wrought iron; 1/8” for austentic alloy steel
IN ACCORDANCE WITH ANSIB16.9 –
B16.28

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).

Units of Description
This standard and applicable material standards are described in both inch-pound units and SI units. However, unless the “M” standard number (SI unit) is specified in the order, the material is supplied in inch-pound units.

Material
The material used for the pipe fittings shall be the forgings, bars, plates, seamless or welded tubular products specified in the chemical composition table.
Smelting
Steel should be smelted using one of the following methods:
a. Electric furnace (with separate and refining optional)
b. Vacuum furnace
c. One of the former followed by vacuum remelting or electroslag- consumable electrode remelting
d. If secondary melting are used, the furnace number refers to all steel ingots remelted with one smelting furnace number.

Manufacture
Forming
The forging or forming operation may be performed by hammer forging, press forging, perforating, extrusion, upsetting, rolling, bending, welding or machining, or two or more methods at the same time. The forming process should ensure that no harmful defects are produced on the pipe fittings.

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.

Surface Finish
Pipe fittings supplied in accordance with this standard shall be visually inspected. The depth of a typical surface discontinuity should be measured.
• Surface crack (fish scales) deeper than 1/64 inch (0.4 mm) should be removed.
• Mechanical flaws deeper than 1/16 inch (1.6 mm) should be removed.
• Except for the above two, the pipe fittings shall not have a surface discontinuity deeper than 5% of the specified nominal wall thickness, and shall have a good machined surface.

sunnysteel

Sunny Steel provide a wide range of steel products as Steel pipes, Seamless tube and seamless pipes, Alloy pipes, Pipe fittings, Composite steel pipe used in the industry, construction etc.

发表评论

此站点使用Akismet来减少垃圾评论。了解我们如何处理您的评论数据

%d 博主赞过: