What is the purpose of Stainless steel 904L pipe fittings?

Corrosion resistance and outstanding durability make these fittings in-demand by multiple industries. Stainless steel 904L pipe fittings work in chemical processing for formulating organic and inorganic acids.

They also work in oil refineries, fertiliser plants (esp. phosphate-based), and equipment for pharmaceuticals or paper-pulp processing. A prime role of these pipe fittings is in condensers and heat exchangers for saltwater applications – thanks to their favourable thermal and corrosion-proof properties.

ASTM A403 WP904L Elbow manufacturer in India

Stainless steel 904L pipe fittings manufacturer in India

What factors should be considered when using an A403 WP904L elbow?

Elbow fittings are widely used in industrial pipelines to divert and manage the flow of the required media. Buyers should select an A403 WP904L elbowthat matches the application needs for curvature (90, 45, or 180 degrees) and ambient pressure and temperature. It should resist pitting and intergranular corrosion.

Engineers have to analyse the centre-to-face distance and judge the kind of fittings – short or long radius elbow. You will also have to decide the kind of connection, wherein buttweld elbows are ideal for higher pressures and temperatures. Buyers can consider threaded elbows for repair or maintenance.

We recommend procuring SS 904L pipe fittings from manufacturers who prioritise quality control. Fully traceable fittings that undergo testing like Positive Material Identification and spectro analysis are likelier to offer long-term, reliable service.

We are one of India’s largest SS 904L buttweld fittings supplier in Mumbai, Save 10% – 15% by ordering online

Stainless steel 904L pipe fittings

Stainless steel 904L pipe fittings

A403 WP904L elbow

A403 WP904L elbow

Stainless steel 904L fittings

Stainless steel 904L fittings

What is the typical lead time or availability of Stainless steel 904L fittings from supplier?

The demand for these pipe fittings is rising across industries, mainly for air pollution control and metallurgical processing. The lead time for stainless steel 904L fittings is 7 to 15 working days. But the availability depends on order volumes.

Suppliers with a sizable repository with multiple sizes and types – like a Werkstoff Nr. 1.4539 end cap – will be able to hasten deliveries. Scalable logistics partners provide attractive lead times.

We are here to assist you with any UNS N08904 tee and reducer required to satisfy the requirements of your project as a stockist of stainless steel 904L fittings.

Stainless steel 904L pipe fittings specifications

Stainless steel 904L pipe fittings specifications

Schedule Applications 904 Fittings Type
SCH 5 to XXS
  • Paper and pulp production
  • Textiles
  • Bitumen upgraders
  • Semiconductors
Elbow, reducer, tee, cap, stub end
Specification 904 Fittings Process Testing methods
ASTM A403 / ASME SA403 Seamless, fabricated, welded
  • Hardness test
  • Fatigue mechanics test
  • Impact test
  • Tensile test
904 Fittings Sizes Standard Hardness
 1/2″ to 48″ ASME B16.9/ ASME B16.28 70-90 HRB
Here you can easily find a large variety of WNR 1.4539 stub ends and end caps at factory prices with all required paperwork.
SS 904L buttweld fittings types

SS 904L buttweld fittings

SS 904L buttweld fittings

  • Testing methods: proof test, hydrotest, NDT test, destructive

ASTM A403 WP 904L tee

ASTM A403 WP 904L tee

  • Application: petrochemical, Chemical, oil and gas
  • Sizes: 1/2″ to 48″

SS 904L reducer

SS 904L reducer

  • Thickness: 1.5MM to 20MM
  • Hardness: 70-90 HRB

UNS N08904 stub end

UNS N08904 stub end

  • Schedule: SCH 5 to SCH XXS
  • Tensile strength : 490 MPa

SS 904L pipe fittings

SS 904L pipe fittings

  • Standard: ASME B16.9/ ASME B16.28 fittings
  • Yield strength : 220 MPa

Werkstoff nr. 1.4539 end cap

Werkstoff nr. 1.4539 end cap

  • Methods: Seamless, welded, buttweld fittings
  • Temperature: 800°F – 1500°F
SS 904L buttweld fittings weight chart
NPS for 904l fittings KG LBS
2-1¼ 0.54 1.2
2-1½ 0.59 1.3
2-3/4
2-1 0.5 1.1
2½-1½ 1 2.2
2½-2 1.11 2.45
2½-1
3-2½ 1.88 4.15
2½-1¼ 0.95 2.1
3-1½ 1.45 3.2
3-1¼
3-2 1.59 3.5
3½-3 2.72 6
3½-2 2.04 4.5
3½-1½
3½-2½ 2.45 5.4
3½-1¼
4-3 3.4 7.5
4-3½ 3.72 8.2
4-2 2.7 5.95
4-1½
4-2½ 4.76 10.5
5-4 5.94 13.1
5-3 5.17 11.4
5-3½ 5.53 12.2
5-2½ 4.76 10.5
6-5 9.39 20.7
5-2
6-4 8.35 18.4
6-3 7.44 16.4
6-3½ 7.85 17.3
6-2½
8-5 16.1 35.5
8-6 17.78 39.2
8-4 14.7 32.4
10-8 32.3 71.2
8-3½
10-6 27.76 61.2
10-4
10-5 25.72 56.7
12-8 43.77 96.5
12-10 50.58 111.5
12-6 38.42 84.7
ASTM A403 WP904L elbow Dimensions
NPS (Normal Pipe Size) OD(Outside Daimeter) 45 Deg Elbow Fittings 90 Deg Elbow Fittings 180 Deg Return Elbow
(inch) Long Radius Elbow Short Radius Long Radius Elbow Long Radius Elbow
inch mm Radius
(Inch)
Center to Face
(Inch)
Center to Face
(Inch)
Center to Face
(Inch)
Back to face
(Inch)
Center to Center
(Inch)
3/4 1.050 26.7 7/16 1 1/8 1 11/16 2 1/4
1/2 0.840 21.3 5/8 1 1/2 1 7/8 2
1 1/4 1.660 42.2 1 1 1/4 1 7/8 2 3/4 3 3/4
1 1.315 33.4 7/8 1 1 1/2 2 3/16 3
1 1/2 1.900 48.3 3 1 1/8 1 1/2 2 1/4 3 1/4 4 1/2
2 1/2 2.875 73.0 5 1 3/4 2 1/2 3 3/4 5 3/16 7 1/2
2 2.375 60.3 4 1 3/8 2 3 4 3/16 6
3 1/2 4.000 101.6 7 2 1/4 3 1/2 5 1/4 7 1/4 10 1/2
3 3.500 88.9 6 2 3 4 1/2 6 1/4 9
5 5.563 141.3 10 3 1/8 5 7 1/2 10 5/16 15
4 4.500 114.3 8 2 1/2 4 6 8 1/4 12
6 6.625 168.3 12 3 3/4 6 9 12 5/16 18
10 10.750 273.1 15 6 1/4 10 15 20 3/8 30
8 8.625 219.1 12 5 8 12 16 5/16 24
12 12.750 323.9 18 7 1/2 12 18 24 3/8 36
Manufacturing standards of DIN 1.4539 stub end
  • MSS SP-43
  • ASME B16.9
  • ASME SA403/ASTM A403
WP grades classes of SS 904L fittings
Construction Fittings Classes Non-destructive Exam
Welded WX Radiography
Welded W Radiography or Ultrasonic
Seamless S None
Welded WU Ultrasonic
Pressure rating of WNR 1.4539 tee
Fittings (psig) Pressure-Temperature ratings
Ratings of Temperature fittings Pressure Class
150 300
1 1/4 – 2 inch. 1/4 – 1 inch. 2 1/2 – 3 inch.
(oC) (oF)
93 200 265 1350 1785 910
-29 to 66 -20 to 150 300 1500 2000 1000
149 300 185 1050 1360 735
121 250 225 1200 1575 825
204 400 750 935 560
177 350 150 900 1150 650
260 500 450 510 385
232 450 600 725 475
288 550 300 300 300
Tolerance of ASTM A403 WP 904L seamless fittings
Pipe Fittings Tolerance
Common Type Of Buttweld Fittings 45 degree elbows And 90 deg elbows fittings 180 Deg Returns
Normal Size Of Steel Pipe ID
at End
OD
at Bevel
WT For (Wall Thickness)
t / t1
Center-End Dai. A-B-C-M Back-Face Dai.
(K)
Center-Center Dai.
(O)
Align-ment of Ends
(U)
3 a 3 1/2 1,6 1 less 2 7 7 1
1/2 a 2 1/2 0,8 1 Not 2 7 7 1
32 a 48 4,8 +7 -5 5
4 1,6 +2 -1 than 2 7 7 1
8 1,6 2 of nominal 2 7 7 1
5 a 6 1,6 +3 -1 87,50% 2 7 7 1
10 3,2 +4 -3 tickness 2 7 7 2
20 a 24 4,8 +6 -5 3 10 2 7
12 a 18 3,2 +4 -3 3 10 2 7
26 a 30 4,8 +7 -5 3
UNS N08904 reducer dimensions
Nominal
Pipe Size
Outside
Diameter
Reducers
Reduced from
(Inch)
(mm) (Inch) Reduced to
(Inch)
Concentric & Eccentric Length
(Inch)
1/2 21.3 0.840 1/4 1 1/2
3/8 1 1/2
3/4 26.7 1.050 3/8 2
1/2 2
1 33.4 1.315 3/8 2
1/2 2
3/4 2
1 1/4 42.2 1.660 1/2 2
3/4 2
1 2
1 1/2 48.3 1.900 1/2 2 1/2
3/4 2 1/2
1 2 1/2
1 1/4 2 1/2
2 60.3 2.375 3/4 3
1 3
1 1/4 3
1 1/2 3
2 1/2 73.0 2.875 1 3 1/2
1 1/4 3 1/2
1 1/2 3 1/2
2 3 1/2
3 88.9 3.500 1 3 1/2
1 1/2 3 1/2
2 3 1/2
2 1/2 3 1/2
3 1/2 101.6 4.000 1 1/4 4
1 1/2 4
2 4
2 1/2 4
3 4
4 114.3 4.500 1 1/2 4
2 4
2 1/2 4
3 4
3 1/2 4
5 141.3 5.563 2 5
2 1/2 5
3 5
3 1/2 5
4 5
6 168.3 6.625 2 1/2 5 1/2
3 5 1/2
3 1/2 5 1/2
4 5 1/2
5 5 1/2
8 219.1 8.625 3 6
3 1/2 6
4 6
5 6
6 6
10 273.1 10.750 4 7
5 7
6 7
8 7
12 323.9 12.750 5 8
6 8
8 8
10 8
Size chart of 904L stainless steel welded fittings
Welded fittings Seamless fittings
Elbows Up to 42″ Up to 24″
End Caps Up to 24″
Tees Upto 36″ Upto 24″
Return Bends Up to 8″
Reducers Up to 48″ Up to 24″
Swage Nipple Up to 4″
Cross Upto 36″ Upto 8″
The only place you’ll find affordable 904l stainless steel seamless and welded fittings widely used in gas scrubbing plants, seawater cooling devices
A403 WP904L elbow chemical composition
C Cu Mn Cr Mo P Ni S
Maximum Maximum Maximum Maximum
0.02 2.0 4.0-5.0 19.0-23.0 23.0-28.0 0.035 0.045 1.0
Stainless steel 904L fittings mechanical properties
Grade Tensile Strength (MPa) minimum Elongation (% in 50mm) minimum Yield Strength 0.2% Proof (MPa) minimum Hardness
Rockwell B (HR B) Brinell (HB)
904L 490 36 220 70-90 typical 150
ASTM A403 WP 904L stainless steel buttweld tee equivalent
STANDARD UNS WERKSTOFF NR. JIS KS AFNOR BS EN
SS 904L Fittings N08904 1.4539 SUS 904L STS 317J5L Z2 NCDU 25-20 904S13 X1NiCrMoCu25-20-5
SS 904L pipe fittings physical properties
Grades (µm/m/°C) Mean Co-eff of Thermal Expansion Density
(kilogram/meter3)
Elastic Modulus
(GPa)
Specific Heat 0-100°C
(J/kg.K)
(W/m.K)Thermal Conductivity Elec Resistivity
(nΩ.m)
0-315°C 0-100°C 0-538°C At 500°C At 20°C
904L Fittings 15 7900 190 500 11.5 952
What is the difference between schedule 40 and schedule 80 SS 904L buttweld fittings?

The schedule of the fittings varies with the wall thickness and the inner diameter. SS 904L buttweld fittings of Schedule 80 are appropriate for a thicker wall but a smaller inner diameter. Schedule 40 can handle lower pressure.

These metrics depend on nominal pipe size (a dimensionless approximation of outer pipe diameter). The correct schedule for a UNS N08904 stub end is critical for the safety, performance, and durability of the pipe.

Are ASTM A403 WP 904L stainless steel buttweld tee corrosion-resistant?

Corrosion resistance is a hallmark of these fittings, thanks to their chemical composition comprising nickel, copper, and molybdenum (4.5%). An ASTM A403 WP 904L stainless steel buttweld tee exhibits medium to high corrosion resistance in various forms: stress cracking, pitting, and general. The range of chemicals it can handle includes chlorides, dilute sulphuric acids, phosphoric, and organic acids.

What are the 6 characteristics of an SS 904L reducer?

A reducer is indispensable for connecting pipes of different diameters. An SS 904L reducer works in numerous industries, including the pharmaceutical sector and refineries.

  • These reducers are available as eccentric (can connect to the side) and concentric (more common).
  • Its high corrosion resistance makes it perfect for applications exposed to acids and seawater.
  • A BS 904S13 reducer gets welded easily, even without using a filler.
  • This material is ductile and formable, with a high tensile strength of 490 MPa. But it may require specific tools because of the addition of elements like molybdenum and nitrogen.
  • It has a high melting point: 1300 to 1390°C.
  • It has a Brinell hardness of 150 HB.
Recommended product