Stainless Steel 904L Union

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ASTM B649 WP904L Stainless Steel Union, Supplier of SS 904L Union, ASTM B649 904L Forged Union, Stainless Steel 904L Pipe Union manufacturer

SS 904L Union Stockist, SS 904L Seamless Union Stockholder, AISI 904L Forged Union, SS 904L Threaded Union Dealer, ANSI B16.9 Stainless Steel 904L Union Distributor, EN 1.4539 Socket weld Union

Alloy 904L ASTM B649 WP904L Screwed Union, ANSI B16.9, ANSI B16.28, MSS SP-43, MSS SP-79 Stainless Steel 904L Union, SUS 904L Threaded Union Stockist, INOX 904L ASTM B649 WP904L Stainless Steel Union, Alloy 904L Butt Weld Union supplier, B366 UNS N08904 Compression Pipe Union, DIN 1.4539 Union Wholesaler, UNS N08904 Buttweld Union

Wrought Austenitic Stainless Steel 904L SCH 5 Union manufacturer, high quality Stainless Steel WP904L Union supplier, 904L SS SCH 10 Union distributor near you, SS Grade WP904L SCH 40 Union stockist, SS 904L SCH 80 Union stockholder, ASTM B649 WP904L NPT Threaded Union for Sale, ASTM B649 WP904L Stainless Steel Reducing Union at Best Price, ASTM B649 WP904L Dielectric Pipe Union suppliers, WP904L Stainless Seamless Union manufacturers, manufacturer of Stainless Steel 100% X-Ray Welded Union WP904L, ASTM B649 WP 904L ANSI B16.9 Union dealer, Distributor of WP 904L Stainless Steel Weld Union, 904L Stainless Steel 36" Ground Joint Pipe Union, supplier of 904L Stainless Steel 24" Union SCH XXS, 904L Stainless Steel 36" SCH 160 Weld Pipe Union exporter in India

  • What is 904L Stainless Steel Union?

Alloy 904L Stainless Steel Union, similar to a coupling, allows the convenient future disconnection of pipes for maintenance or fixture replacement. In contrast to a coupling requiring solvent welding, soldering, or rotation (for threaded couplings), an AISI 904L Union allows easy connection and disconnection, multiple times if needed. It consists of three parts: a nut, a female end and a male end. When the female and male ends are joined, the nut seals the joint by pressing the two ends tightly together. Grade 904L Stainless Steel Unions are a type of very compact flange connector.

SS 904L Pipe unions connect two pipes together in a way that requires only one pipe to be turned when removing the union, facilitating repairs. 904L Stainless Steel Pipe Unions also prevent galvanic corrosion when connecting pipes of dissimilar metals.

Anchor Fasteners India is a specialized manufacturer, supplier and exporter of SS 904L union fitting including BS 904S13 union pipe fitting, SAE 904L Compression Pipe Union, SS 904L Dielectric Pipe Union, AISI 904L Ground Joint Pipe Union, SS 904L Union Conical Female/ Female NPT, Pipe Union, Weld Pipe Union, steel union fitting, stainless steel union fitting, alloy union fitting and alloy steel union fitting.

We Specialise in Manufacturing Large Diameter and High Thickness ASTM B649 Seamless, Welded Stainless Steel 904L Union. All SS 904L Union are manufactured in India, with raw materials coming from reputed Mills in India and overseas. We are stockholder and supplier of 904L Stainless Steel Union in a wide range sizes, surface treatment, and ASTM standards. UNS N08904 | WNR 1.4539 | Alloy 904L.

  • 904L Stainless Steel Union Specification

SS 904L Union SpecificationProduct Name: 904L Stainless Steel Union
We accept all small/large quantity orders.

  • 904L Grade: SUPER AUSTENITIC 904L Union/ SS 904L Union/ WNR 1.4539 Union/ UNS N08904 Union/ AISI 904L Union/ SUS 904L Union/ INOX 904L Union/ Alloy 904L Union/ URANUS B6 Union/ VdTÜV 421 Union/ SEW 400 Union/ 2RK65 Union/ RVS 904L Union/ SAE 904L Union/ NAS 255 Union/ AFNOR Z2 NCDU 25-20 / BS 904S13 / KS STS 317J5L / EN X1NiCrMoCu25-20-5 / NACE MR0175
  • Typical manufacturing specifications: ASTM B649 WP904L, ASTM B649 WP904L, ASME SB366 WP904L, ASME SB366 WP904L, ASTM A960, MSS SP-43, ASTM B16.9
  • Origin: European Origin, Indian Origin, US Origin, Korean Origin, Sweden Origin, Ukraine Origin, Japanese Origin Materials
  • Top 10 Manufacturer of 904L Union: Raccortubi S.p.A. Pipe Union, Italy, Erne Fittings Pipe Union, Austria, Melesi Pipe Union, Italy, Mega Pipe Union, Italy, Ulma Pipe Union, Spain, TecnoForge Pipe Union, Italy, BENKAN Corporation Pipe Union, Japan, BKL- Thai Benkan Pipe Union, Thailand, Lame S.r.l. Pipe Union, Italy, Metal far Pipe Union, Italy, Anchor Fasteners India, India
  • Great offer on: Pipe caps- DIN 28011 / EN 10253 (DIN 2617), Pipe Elbow -EN 10253 type A (DIN 2605), Pipe Tee/ T-pieces with same outlet – EN 10253 type A (DIN 2615), Concentric reducers- EN 10253 type B (DIN 2616)
  • Delivery: 15-20 days
  • Application: Research, science, and industry for sterile and aseptic process engineering.
  • Material: DIN 1.4305, DIN 1.4301, DIN 1.4307, DIN 1.4948, DIN 1.4401, DIN 1.4404, DIN 1.4919, DIN 1.4571, DIN 1.4541, DIN 1.4878, DIN 1.4460, DIN 1.4550, DIN 1.4961, DIN 1.4840, DIN 1.4845, DIN 1.4449, DIN 1.4438, DIN 1.4841, DIN 1.4006, DIN 1.4005, DIN 1.4021, DIN 1.4016, DIN 1.4104, DIN 1.4057, DIN 1.4125, DIN 1.4762, DIN 1.4742, DIN 1.4539, DIN 1.4542, DIN 1.4545, DIN 1.4534, DIN 1.4980, DIN 1.3964
S 904L Union Manufacturing Standards ASME: ANSI B16.9, ANSI B16.11, ANSI B16.28, MSS-SP-43, DIN: DIN2605, DIN2615, DIN2616, DIN2617, DIN28011, EN: EN10253-1, EN10253-2
Size Range 1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated)
Thickness SCH: 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS, Custom Thickness
Dimension B16.5, BS 4504, EN-1092
Other Stainless Steel Union grades ASTM A403 WP 304/ 304L/ 304H/ 316/ 316L/ 317/ 317L/ 321/ 310/ 347/ 2205 Duplex Pipe Tee/ ASTM B649 904L Pipe Tee
Value Added Service Polish (Electro & Commercial)
Heat Treatment
Annealed & Pickled
Sand Blasting
Machining Etc.
Manufacture Standard: ASME B16.9, ASME B16.11, ASME B16.28, MSS SP-43, JISB2311, JIS B2312, JIS B2313, DIN 2605, DIN 2606, DIN2615, DIN2616, BG12459-90, GB/T13401, HGJ514, SH3408, SH3409, HG/T21635, HG/T21631

  • Types of 904L Stainless Steel Union

    • 904L Union supplier
    • Stainless Steel 904L Union
    • 904L Stainless Steel Union manufacturer
    • 904L Stainless Union
    • SS 904L Union manufacturer
    • Alloy 904L Stainless Steel Union
    • AISI 904L Union supplier
    • SUS 904L Union manufacturer
    • INOX 904L Union
    • Alloy 904L Union
    • ASTM B649 Stainless Steel 904L Union
    • WNR 1.4539 Union supplier
    • UNS N08904 Union manufacturer
    • Super Austenitic 904L Union
    • Grade 904L Stainless Steel Union
    • Stainless Steel Union Grade 904L
    • SS DIN 1.4539 Union
    • URANUS B6 Union manufacturer
    • VdTÜV 421 Union
    • BS 904S13 Union
    • SEW 400 Union manufacturer
    • 2RK65 Union
    • 904L Stainless Steel NPT Threaded Union
    • KS STS 317J5L manufacturer
    • RVS 904L Union
    • SAE 904L Union supplier
    • NAS 255 Union
    • ASTM B649 WP904L Union
    • ASME SB366 Union manufacturer
    • ASTM B649 UNS N08904 Union

    • ASME SB366 UNS N08904 Union manufacturer
    • 904L Stainless Steel Seamless Union
    • ASTM B649 Seamless Union exporter
    • 904L Stainless Steel Welded Union
    • ASTM B649 Welded Union manufacturer
    • ASTM B649 WP 904L Union
    • 904L Stainless Steel Forged Union
    • ASTM B649 Weld Union supplier
    • 904L Stainless Steel Threaded Union
    • 904L Stainless Steel Screwed Union
    • 904L Stainless Steel Butt Weld Union
    • 904L Stainless Steel Buttweld Union
    • SS 904L SCH 5 Union manufacturer
    • 904L Stainless Steel SCH 10 Union
    • SS 904L SCH 40 Union manufacturer
    • SS 904L SCH 80 Union
    • 904L Stainless Steel Reducing Union
    • 904L Stainless Steel Dielectric Pipe Union
    • ASTM B649 WP904L 36" Union
    • ASTM B649 WP904L 24" Union SCH XXS
    • ASTM B649 WP904L 36" SCH 160 Union
    • ASTM B649 WP904L 24" Union SCH 80S
    • ASTM B649 WP904L Union 24" x 12" SCH 160
    • ASTM B649 WP904L Seamless Union manufacturer
    • ASTM B649 WP904L 100% X-Ray Welded Union
    • ASTM B649 WP904L ANSI B16.9 Union
    • Seamless Union, ASTM B649 WP Grade

  • 904L Stainless Steel Union Packaging & Shipping:

904L Stainless Steel Union Packed

904L Stainless Steel Union Packed

SS 904L Union Packing: We focus on every procedure to assure quality, the package we usually take is pack WNR 1.4539 Union with environmental poly bags, and then in free fumigation wooden cases or wooden palte. Also can accept customized package such as OEM by negotiation.

Anchor Fasteners India offers just about everything to meet your UNS N08904 Union pack requirements. Lot of emphasis is placed on the packing and packaging. The AISI 904L Union are packed in wooden corrugated boxes foiled in plastic wraps and bubble wraps.

904L Stainless Steel Union Marking: All SUS 904L Union are marked with size and specification. Or as per customer’s requirement;

So, besides the fact that we can arrange freight transportation for you, we can before that:

  • Specifically mark parts or packages;
  • Provide for a special packing according to what is required by the shipping method or by you.

We mark the INOX 904L Union as needed with the most suitable marking technique.

When packaging and packing, our experienced warehouse staff systematically takes the greatest precautions for your Alloy 904L Union to be optimally protected during transportation. We pack the URANUS B6 Union according to the appropriate method: strapped pallet, wooden crate, overseas packing (ISPM15).

Markings on the Stainless Steel 904L, UNS N08904,  WNR 1.4539 Union

The full identification of the Union should be continuously marked down its whole length, including:

  1. Nominal Union Size of 904L Union
  2. Schedule (Wall Thickness) eg SCH 40 SS 904L Union
  3. Specification of SS 904L Union
  4. Grade of Alloy 904L Union
  5. Method of Manufacture (Seamless or Welded) of of SS 904L Union
  6. Heat Number for of SS 904L Union
  7. Manufacturer’s Name or Symbol of of 904L SS Union
  8. Customized marking available for SS 904L Union


Get 904L Stainless Steel Union price list, send an email to us at [email protected], [email protected]

  • 904L Stainless Steel Union Dimensions

904L Stainless Steel Union Dimensions

904L Stainless Steel Union Dimensions

Nom. Pipe Size Pipe End Min Socket Bore Dia. Socket Wall Min. Water Way Bore Laying Length Male Flange Min. Nut Min. Threads Per 25.4 Max Bearing Min. Depth of Socket Min. Length Assem. Nominal Clear Assem. Nut
  A B C D E F G H J K L N
1/8 21.8 10.92
3.17 6.83
3.17 3.17 16 1.24 9.6 41.1 49.0
¼ 21.8 14.22
3.30 9.85
3.17 3.17 19 1.24 9.6 41.4 49.0
3/8 25.9 17.78
3.48 13.92
3.43 3.43 14 1.37 9.6 46.0 55.0
½ 31.2 21.84
4.06 17.47
3.68 3.68 14 1.50 9.6 49.0 57.0
¾ 37.1 27.18
4.27 21.79
4.06 4.06 11 1.68 12.7 56.9 67.0
1 45.5 34.04
4.95 28.14
4.57 4.44 11 1.85 12.7 62.0 79.0
11/4 54.9 42.67
5.28 35.76
5.33 5.21 11 2.13 12.7 71.1 94.0
11/2 61.5 48.77
5.54 41.61
5.84 5.59 10 2.31 12.7 75.5 111.0
2 75.2 61.47
6.05 52.53
6.60 6.35 10 2.69 15.8 86.1 132.0
21/2 91.7 74.17
7.65 64.72
7.49 7.11 8 3.07 15.8 102.4 148.0
3 109.2 90.17
8.31 77.67
8.25 8.00 8 3.53 15.8 109.0 175.0

  • SS 904L Other Products Stock List

  • 904L Stainless Steel Union Chemical Composition
































  • 904L Stainless Steel Union Mechanical Properties


Tensile Strength (MPa) min

Yield Strength 0.2% Proof (MPa) min

Elongation (% in 50mm) min


Rockwell B (HR B)

Brinell (HB)





70-90 typical


  • 904L Stainless Steel Union Corrosion Resistance

The high content of alloying elements in 904L Union gives the alloy exceptionally good resistance to uniform corrosion.

Uniform Corrosion in pickling acid* at 25°C

ALLOY Corrosion Rate, mm/year
316L >6
904L 0.47
254 SMO® 0.27
654 SMO® 0.06

*Composition: 20% HNO3 + 4 HF

Uniform Corrosion in wet process phosphoric acid at 60°C

ALLOY Corrosion Rate, mm/year
316L >5
904L 1.2
254 SMO® 0.05

Composition: 54% P2O5, 0.06% HCI, 1.1% HF, 4,0% H2SO4, 0.27% Fe2O3, 0.17% AI2O3, 0.10% SiO2, 0.20% CaO and 0.70% MgO.

Corrosion rates in fatty acid column for the distillation of tall oil at 253°C

ALLOY Corrosion Rate, mm/year
316L 0.88
317LMN 0.29
904L 0.056
254 SMO® 0.01

  • Physical Properties of 904L Stainless Steel Union



Elastic Modulus

Mean Co-eff of Thermal Expansion (µm/m/°C)

Thermal Conductivity

Specific Heat 0-100°C

Electrical Resistivity




At 20°C

At 500°C










33.5 Microhm-in at 68°F
95.2 Microhm-cm at 20°C

Alloy 904L Union Melting Range:

Mean Coefficient of Thermal Expansion

Temperature Range    
°F °C in/in/°F cm/cm/°C
68–212 20–100 8.5 x 10-6 15.3 x 10-6

SS 904L Union Special characteristics

Temperature range: Density kg/dm³ Hardness (HB)
pressure bomb/pressure vessel
– 60°C bis 400°C
7,9 ≤ 230
excellent stability against pitting corrosion, stress corrosion and intergranular corrosion

  • 904l Material Specifications



Old British


Swedish SS










Normen KS AFNOR NAS Japanese JIS G4304/4305  
VdTÜV 421, SEW 400 STS 317J5L Z2 NCDU 25-20 NAS 255 SUS 904L  

  • 904L Stainless Steel Union Possible Alternative Grades

904l Stainless Steel Union Equivalent Grades


Features of alternative grades of SS 904L


A lower cost alternative, but with much lower corrosion resistance.


A higher resistance to pitting and crevice corrosion is needed.


A very similar corrosion resistance, with the 2205 having higher mechanical strength, and at a lower cost to 904L. (2205 not suitable for temperatures above 300°C.)

Super duplex

Higher corrosion resistance is needed, together with a higher strength than 904L.

The steel shall conform to the requirements as to chemical composition specified.
The material shall conform to the mechanical properties specified.

SUS 904L Union Heat Resistance

Grade 904L stainless steels Union offer good oxidation resistance. However, the structural stability of this grade collapses at high temperatures, particularly above 400°C.

AISI 904L Union Heat Treatment

Grade 904L stainless steels Union can be solution heat-treated at 1090 to 1175°C, following by rapid cooling. Thermal treatment is suitable for hardening these grades.

SS 904L Union Fabrication

Grade 904L stainless steel Union are high purity steels with low sulphur content. They can be machined using any standard methods. These grades can be readily bent to a small radius under cold conditions. Although subsequent annealing is not required in most cases, it should be carried out when the fabrication is performed under severe stress corrosion cracking conditions.

904L Stainless Steel Union producing through Cold forming

904L stainless steel Union is quite ductile and forms easily. The addition of molybdenum and nitrogen implies more powerful processing equipment may be necessary when compared with the standard 304/304L grades.

Stainless Steel 904L Union Machining

The cold work hardening rate of Alloy 904L Union makes it less machinable than 410 and 304 stainless steel Union.

904L Union Welding

Welding of grade 904L stainless steels Union can be performed using all conventional methods. This grade does not require pre-heat and post-weld heat treatments. Grade 904L Union can be subjected to hot cracking in constrained weldment. Grade 904L electrodes and rods are used for welding grade 904L steel Union according to AS 1554.6.

Alloy 904L Union Hot Forming

Working temperatures of 1562 – 2102°F (850 –1150°C) are recommended for hot working processes. It is important that the entire workpiece be quenched from temperatures above 2012°F (1100°C). In the event of partial heating or cooling below 2012°F (1100°C), or if the cooling has been too slow, hot working should always be followed by a solution anneal and quenching. 904L Union should be solution annealed at 1940 – 2084°F (1060 –1140°C).

904L Stainless Steel Union Applications & Usage:

Some of the major applications of grade stainless steel 904L Union include:

  • SAE 904L Union for Air Pollution Control- scrubbers for coal-fired power plants
  • UNS N08904 Union mainly used for Seawater cooling devices
  • SS 904L Union can be use in Wiring in electrostatic precipitators
  • WNR 1.4539 Union are used in Oil refinery components
  • AISI 904L Union also useful for Gas scrubbing plants
  • SUS 904L Union are commonly used by Pulp and paper processing industries
  • INOX 904L Union are also suitable for Acetic, phosphoric and sulphuric acid processing plants
  • Alloy 904L Union available for Oil and Gas Production- offshore process equipment
  • Offshore, sea water technology, chemical industry, good stability against reducing acids of medium strength like sulphuric acid and phosphoric acid and various chloric media, refinery, paper industry, pulp industry

Export Destinations for 904L Stainless Steel Union

Anchor Fasteners India is a leading exporter and distributor of stainless steel 904L Union in India and international markets such as Malaysia, Iran, Germany, UK, Canada, UAE, Bahrain, Indonesia, Mexico, Chile, Brazil, Peru, Nigeria, Kuwait, Jordan, Thailand (Bangkok), Saudi Arabia, Venezuela, Russia, Turkey, Australia, New Zealand, Sri Lanka, Vietnam, South Africa, Kazakhstan. A widest range of SS 904L Union ready stock available in Middle East countries including Bahrain, Iraq, Israel, Jordan, Cyprus, Egypt, Iran, Kuwait, Lebanon, Oman, Saudi Arabia, Syria, Turkey, United Arab Emirates, Palestine, Qatar and Yemen. Get best deals from distributor of 904L Stainless Steel Union.

Domestic Supply Destinations for Stainless Steel 904L Union and UNS N08904 Polished Union

Our SS 904L products are supplied to all major Industrial areas and cities in India such as Mumbai, Ahmedabad, Chennai, Bangalore, Hyderabad, Assam, Siliguri, Kolkata, Surat, Pune, Nagpur, Indore, Thane, Bhopal, Visakhapatnam, Delhi, Vadodra, Nashik, Thoothukudi, Rajkot, Aurangabad, Salem, Bhilai, Bhiwandi, Bikaner, Jamshedpur, Warangal, Nellore, Agartala, Ranchi, Coimbatore, Raipur, Mysore, Mangalore, Kochi (Cochin), Bhavnagar, Tirupur, Ankleshwar, Bhubaneswar and Faridabad. For any location in your country you can find here trader of Stainless Steel 904L Union in India, If your requirement is urgent we can offer a priority shipping service, but also if time is not so critical we can offer more cost-effective options to ensure you get the best value for money.

Available Union Stock, a huge selection of steel Union inventory:

  • 904l Union Price

India’s Prominent manufacturer & supplier of Stainless Steel 904L Union. We maintain bulk stock of 904L Union. Supplier & distributor of Alloy 904L Union globally in any size & schedule. We have a large inventory 904L Union, UNS N08904 SS 904L screwed Union, WNR 1.4539 SS Grade WP904L Union, Source for ASME SB366 Stainless Steel WP 904L threaded Union, Alloy 904L buttweld Union. We have extended our stock program for you: ASME B16.9 stainless steel grade 904l Large Diameter and High Thickness ASTM B649 Seamless, Welded Stainless Steel Union, available from stock.

Distributor, Manufacturer, Suppliers, Stockholder, Traders, Wholesaler, Dealer, Distributor, Importer & Exporter, Fabricator, Stockist of ASTM B649 WP904L Stainless Steel 904L Union
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