A complete overview of ASTM materials for buttweld fittings: ASTM A234 (carbon and low-alloy steel), ASTM A403 (stainless steel), ASTM A815 (duplex and super duplex), and ASTM B366 (nickel alloys). The article reviews the chemical and mechanical properties of these pipe fittings specifications and their common uses.
BUTTWELD FITTINGS MATERIALS
Carbon steel buttweld fittings are common for pipelines and process piping in the oil and gas and power generation industry, stainless steel fittings are for higher temperature, pressure and corrosion applications (desalination, pharmaceutical and, food sectors).
Let’s dive into the three main groups of materials for buttweld fittings, ASTM A234 (carbon/alloy pipe fittings), ASTM A403 (stainless steel), and ASTM A815 (duplex and super duplex BW pipe fittings).
Important to note that the material of the pipe and the buttweld fitting shall match (for example, an ASTM A106 Gr. B pipe shall be connected to an ASTM A234 WPB BW fitting, or an ASTM A312 T304 pipe has to be welded to an ASTM A403 WP304 fitting and so on). It is not possible to use pipes and buttweld fittings of different materials. Likewise, the size of the buttweld fitting and the size of the connected pipe shall match.
The fittings materials compatible with specific pipes are shown in the piping materials match table.
CARBON/ALLOY STEEL BUTTWELD FITTINGS (ASTM A234)
The ASTM A234 specification covers carbon steel and alloy steel pipe fittings (butt weld) for high-temperature service.
A234 WPA, WPC and, WPC fittings match ASTM A53, ASTM A106 and, API 5L Gr. B pipes. A234 WP1 to WP91 butt weld fittings match ASTM A335 chrome-moly pipes.
The ASTM A420 specification covers low-temperature carbon steel butt weld fittings to match ASTM A333 Gr.3 and ASTM A333 Gr. 6 pipes; the ASTM A860 specification (WPHY42, WPHY52, WPHY56, WPHY60) covers high yield wrought carbon steel fittings that match high yield API 5L Gr. X42, X52, X56, X60 pipes.
ASTM A234 Chemical Composition
| Chemical composition of ASTM A234 Carbon and Alloy Steel Fittings | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Grade | C | Mn | P max | S max | Si | Cr | Mo | Ni | Cu | Others |
| WPB (1,2,3,4,5) |
0.30 max |
0.29-1.06 | 0.050 | 0.058 | 0.10 min |
0.40 max |
0.15 max |
0.40 max |
0.40 max |
V 0.08 max |
| WPC (2,3,4,5) |
0.35 max |
0.29-1.06 | 0.050 | 0.058 | 0.10 min |
0.40 max |
0.15 max |
0.40 max |
0.40 max |
V 0.08 max |
| WP1 | 0.28 max |
0.30-0.90 | 0.045 | 0.045 | 0.10-0.50 | 0.44-0.65 | ||||
| WP12 CL1 | 0.05- 0.20 |
0.30-0.80 | 0.045 | 0.045 | 0.60 max |
0.80-1.25 | 0.44-0.65 | |||
| WP12 CL2 | 0.05- 0.20 |
0.30-0.80 | 0.045 | 0.045 | 0.60 max |
0.80-1.25 | 0.44-0.65 | |||
| WP11 CL1 | 0.05- 0.15 |
0.30-0.60 | 0.030 | 0.030 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | |||
| WP11 CL2 | 0.05- 0.20 |
0.30-0.80 | 0.040 | 0.040 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | |||
| WP11 CL3 | 0.05- 0.20 |
0.30-0.80 | 0.040 | 0.040 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | |||
| WP22 CL1 | 0.05- 0.15 |
0.30-0.60 | 0.040 | 0.040 | 0.50 max |
1.90-2.60 | 0.87-1.13 | |||
| WP22 CL3 | 0.05- 0.15 |
0.30-0.60 | 0.040 | 0.040 | 0.50 max |
1.90-2.60 | 0.87-1.13 | |||
| WP5 CL1 | 0.15 max |
0.30-0.60 | 0.040 | 0.030 | 0.50 max |
4.0-6.0 | 0.44-0.65 | |||
| WP5 CL3 | 0.15 max |
0.30-0.60 | 0.040 | 0.030 | 0.50 max |
4.0-6.0 | 0.44-0.65 | |||
| WP9 CL1 | 0.15 max |
0.30-0.60 | 0.030 | 0.030 | 1.00 max |
8.0-10.0 | 0.90-1.10 | |||
| WP9 CL3 | 0.15 max |
0.30-0.60 | 0.030 | 0.030 | 1.00 max |
8.0-10.0 | 0.90-1.10 | |||
| WPR | 0.20 max |
0.40-1.06 | 0.045 | 0.050 | 1.60- 2.24 |
0.75-1.25 | ||||
| WP91 | 0.08- 0.12 |
0.30-0.60 | 0.020 | 0.010 | 0.20-0.50 | 8.0-9.5 | 0.85-1.05 | 0.40 max |
V 0.18- 0.25 Nb 0.06-0.10 N 0.03-0.07 Al 0.02 max(6) Ti 0.01 max(6) Zr 0.01 max(6) |
|
| WP911 | 0.09- 0.13 |
0.30-0.60 | 0.020 | 0.010 | 0.10-0.50 | 8.0-9.5 | 0.90-1.10 | 0.40 max |
V 0.18-0.25 Nb 0.060-0.10 N 0.04-0.09 Al 0.02 max(6) B 0.0003-0.006 W 0.90-1.10 Ti 0.01 max(6) Zr 0.01 max(6) |
|
Notes:
- Fittings from bar or plate 0.35 max carbon.
- Fittings from forgings 0.35 max Carbon and 0.35 max Silicon with no minimum.
- For each reduction of 0.01% below the specified Carbon maximum, an increase of 0.06% Manganese above the specified maximum is permitted, up to a maximum of 1.35%.
- The sum of Cu, Ni, Niobium, and Moly shall not exceed 1.00%.
- The sum of Niobium and Moly shall not exceed 0.32%.
- Applies to heat and product analyses
ASTM A234 Mechanical Properties
| Tensile and Yield Strength ASTM A234 for Carbon and Alloy Steel Fittings | WPB |
WPC, WP11-CL2 |
WP11-CL1, WP22-CL1 WP5-CL1 WP9-CL1 |
WP11-CL3, WP22-CL3 WP5-CL3 WP9-CL3 |
WP91 |
|---|---|---|---|---|---|
| Tensile strength, minimum unless a range is given ksi (MPa) | 60 (415) | 70 (485) | 60 (415) | 75 (520) | 90 (620) |
| Yield strength, min ksi (MPa) (0.2% offset or 0.5% extension under-load) | 35 (240) | 40 (275) | 30 (205) | 45 (310) | 60 (415) |
| Elongation ASTM A234 for Carbon and Alloy Steel Fittings |
WPB, WPC, WP11, WP22 |
WP91 | ||
|---|---|---|---|---|
| Longitud. | Transverse | Longitud. | Transverse | |
|
Standard round specimen, or small proportional specimen, min % in 4 D |
22 | 14 | 20 | 13 |
|
Rectangular specimen for wall thickness 5/16″ and over, and for all small sizes tested in full section; min % in 2 in. |
30 | 20 | ||
|
Rectangular specimen for wall thickness less than 5/16″; min % in 2 in (1/2″ wide specimen) |
see note | |||
Note: For each 0.79 mm decrease in wall thickness below 7.94 mm, a deduction of 1.5 % for longitudinal and 1.0 % for transverse from standard values are permitted
STAINLESS STEEL BUTTWELD FITTINGS (ASTM A403)
The ASTM A403 specification covers austenitic stainless steel butt weld fittings to match ASTM A312 TP304, TP316, TP321, etc., pipes.
ASTM A403 Chemical Composition
| Grade | UNS | C | Mn | P | S | Si | Ni | Cr | Mo | Ti | N | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WPXM-19 | S20910 | 0.06 | 4.0-6.0 | 0.045 | 0.03 | 1 | 11.5-13.5 | 20.5-23.5 | 1.50-3.0 | 0.20-0.40 | ||
| WP304 | S3040 | 0.08 | 2 | 0.045 | 0.03 | 1 | 8.0-11.0 | 18.0-20.0 | ||||
| WP304L | S30403 | 0.030 (4) |
2 | 0.045 | 0.03 | 1 | 8.0-12.0 | 18.0-20.0 | ||||
| WP304H | S30409 | 0.04-0.10 | 2 | 0.045 | 0.03 | 1 | 8.0-11.0 | 18.0-20.0 | ||||
| WP304N | S30451 | 0.08 | 2 | 0.045 | 0.03 | 1 | 8.0-11.0 | 18.0-20.0 | 0.10-0.16 | |||
| WP304LN | S30453 | 0.03 | 2 | 0.045 | 0.03 | 1 | 8.0-11.0 | 18.0-20.0 | 0.10-0.16 | |||
| WP309 | S3090 | 0.2 | 2 | 0.045 | 0.03 | 1 | 12.0-15.0 | 22.0-24.0 | ||||
| WP310S | S3108 | 0.08 | 2 | 0.045 | 0.03 | 1 | 19.0-22.0 | 24.0-26.0 | ||||
| WPS31254 | S31254 | 0.02 | 1 | 0.03 | 0.01 | 0.8 | 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 | 0.045 | 0.03 | 1 | 10.0-14.0 | 16.0-18.0 | 2.0-3.0 | |||
| WP316L | S31603 | 0.030 align=”center”(4) | 2 | 0.045 | 0.03 | 1 | 10.0-14.0 (5) |
16.0-18.0 | 2.0-3.0 | |||
| WP316H | S31609 | 0.04-0.10 | 2 | 0.045 | 0.03 | 1 | 10.0-14.0 | 16.0-18.0 | 2.0-3.0 | 0.10-0.16 | ||
| WP316N | S31651 | 0.08 | 2 | 0.045 | 0.03 | 1 | 10.0-13.0 | 16.0-18.0 | 2.0-3.0 | 0.10-0.16 | ||
| WP316LN | S31653 | 0.03 | 2 | 0.045 | 0.03 | 1 | 10.0-13.0 | 16.0-18.0 | 2.0-3.0 | 0.10-0.16 | ||
| WP317 | S3170 | 0.08 | 2 | 0.045 | 0.03 | 1 | 11.0-15.0 | 18.0-20.0 | 3.0-4.0 | |||
| WP317L | S31703 | 0.03 | 2 | 0.045 | 0.03 | 1 | 11.0-15.0 | 18.0-20.0 | 3.0-4.0 | |||
| WPS31725 | S31725 | 0.03 | 2 | 0.045 | 0.03 | 1 | 13.5-17.5 | 18.0-20.0 | 4.0-5.0 | 0.2 | ||
| WPS31726 | S31726 | 0.03 | 2 | 0.045 | 0.03 | 1 | 13.5-17.5 | 17.0-20.0 | 4.0-5.0 | 0.10-0.20 | ||
| WPS31727 | S31727 | 0.03 | 1 | 0.03 | 0.03 | 1 | 14.5-16.5 | 17.5-19.0 | 3.8-4.5 | 0.15-0.21 | Cu2.8-4.0 | |
| WPS32053 | S32053 | 0.03 | 1 | 0.03 | 0.01 | 1 | 24.0-26.0 | 22.0-24.0 | 5.0-6.0 | 0.17-0.22 | ||
| WP321 | S3210 | 0.08 | 2 | 0.045 | 0.03 | 1 | 9.0-12.0 | 17.0-19.0 | -6 | |||
| WP321H | S32109 | 0.04-0.10 | 2 | 0.045 | 0.03 | 1 | 9.0-12.0 | 17.0-19.0 | -7 | |||
| WPS33228 | S33228 | 0.04-0.08 | 1 | 0.02 | 0.015 | 0.3 | 31.0-33.0 | 26.0-28.0 | Ce 0.05-0.10 Al 0.025Nb 0.6-0.10 | |||
| WPS34565 | S34565 | 0.03 | 5.0- 7.0 |
0.03 | 0.01 | 1 | 16.0-18.0 | 23.0-25.0 | 4.0-5.0 | 0.40-0.60 | Nb 0.10 | |
| WP347 | S3470 | 0.08 | 2 | 0.045 | 0.03 | 1 | 9.0-12.0 | 17.0-19.0 | ||||
| WP347H | S34709 | 0.04-0.10 | 2 | 0.045 | 0.03 | 1 | 9.0-12.0 | 17.0-19.0 | ||||
| WP348 | S3480 | 0.08 | 2 | 0.045 | 0.03 | 1 | 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 | 0.045 | 0.03 | 1 | 9.0-12.0 | 17.0-19.0 | Nb+Ta= 83(C)-1.10Ta 0.10Co 0.20 | |||
| WPS38815 | S38815 | 0.03 | 2 | 0.04 | 0.02 | 5.5- 6.5 |
13.0-17.0 | 13.0-15.0 | 0.75-1.50 | Cu 0.75-1.50Al 0.30 |
Notes:
- Maximum, if not otherwise indicated.
- The method of analysis for Nitrogen is agreed between the purchaser and manufacturer.
- Niobium 0.10-0.30%; Vanadium, 0.10-0.30%.
- 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.
- On pierced tubing, the Nickel maybe 11.0-16.0%.
- 5 X (C+N2)-0.70.
- 4 X (C+N2) -0.70.
- The Niobium % shall be ten times above the Carbon content and not more than 1.10%.
- The Niobium % shall be eight times above the Carbon content and not more than 1.10%.
ASTM A403 Mechanical Properties
| Tensile and Elongation Requirements ASTM A403 | WP304, WP316 | WP304L, WP316L | |
| Yield Strength, min, ksi [MPa] | 30 [205] | 25 [170] | |
| Tensile Strength, min, ksi [MPa] | 75 [515] | 70 [485] | |
| Elongation | Longitudinal | 28 | 28 |
| Transverse | 20 | 20 | |
DUPLEX/ SUPER DUPLEX BUTTWELD FITTINGS (ASTM A815)
The ASTM A815 specification covers duplex and super duplex butt weld fittings to match ASTM A790 and ASTM A928 pipes. These special grades of stainless steel are used for various chemical processes, piping, oilfield piping and heat exchangers, flue gas desulfurization processes.
Duplex stainless steel has the following advantages over Series 300 standard SS:
- Good general corrosion resistance and high strength
- Higher resistance to chloride stress corrosion cracking
- Resistance to chloride pitting and crevice corrosion
- Good sulfide stress corrosion resistance
- Easy to weld and conform
UNS S31803, UNS S32205 Chemical Composition (Duplex)
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| S32205 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 21.0 – 23.0 | 2.50 – 3.50 | 4.50 – 6.50 | 0.8 – 0.20 | 63.54 min |
UNS S31803, UNS S32205 Mechanical Properties (Duplex)
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 / S32205 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
UNS S32750, UNS S32760 Chemical Composition (Super Duplex)
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S 32750 | 0.030 max | 1.20 max | 0.80 max | 0.035 max | 0.020 max | 24.00 – 26.00 | 3.00 – 5.00 | 6.00 – 8.00 | 0.24 – 0.32 | 58.095 min |
| S 32760 | 0.05 max | 1.00 max | 1.00 max | 0.030 max | 0.010 max | 24.00 – 26.00 | 3.00 – 4.00 | 6.00 – 8.00 | 0.20 – 0.30 | 57.61 min |
UNS S32750, UNS S32760 Mechanical Properties (Super Duplex)
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S32750 / S32760 | 7.8 | 0.281 | 1350 | 2460 |
NICKEL ALLOY BUTTWELD FITTINGS (ASTM B366)
Nickel alloy buttweld fittings are used for higher pressure/temperature and corrosive media, where lower grades would fail. The ASTM B366/SB 366 specification covers these high-alloy grades buttweld fittings (super-alloys) as Inconel, Incoloy, Hastelloy and the others listed in the table below. The MSS-SP 43 specification, instead, covers the dimensions and the tolerances of nickel alloy buttweld fittings.
Nickel-Alloy Buttweld Fittings Grades
| Name | UNS | DIN | Matching Pipe Grade | Equivalent Forged Grade |
| 904L | N08904 | 1.4539 | B677/B673 | B649 |
| Alloy 020 | N08020 | 2.466 | B729/B464 | B462 |
| Alloy 230 | N06230 | – | B622/B619 | B564 |
| Alloy 400 (Monel) | N04400 | 2.436 | B165/B725 | B564 |
| Alloy 59 | N06059 | 2.4605 | B622/B619 | B564 |
| Alloy 600 (Inconel) | N06600 | 2.4816 | B167/B517 | B564 |
| Alloy 625 (Inconel) | N06625 | 2.4856 | B444/B705 | B564 |
| Alloy 800 (Incoloy) | N08800 | 1.4558 | B407/B514 | B564 |
| Alloy 800H (Incoloy) | N08810 | 1.4958 | B407/B514 | B564 |
| Alloy 800HT (Incoloy) | N08811 | 1.4959 | B407 | B564 |
| Alloy 825 (Incoloy) | N08825 | 2.4858 | B423/B705 | B564 |
| Alloy B | N10001 | – | B622/B619 | – |
| Alloy B2 (Hastelloy) | N10665 | 2.4617 | B622/B619 | – |
| Alloy B3 (Hastelloy) | N10675 | – | B622/B619 | B564 |
| Alloy C22 (Hastelloy) | N06022 | 2.4602 | B622/B619 | B564 |
| Alloy C276 (Hastelloy) | N10276 | 2.4819 | B622/B619 | B564 |
| Alloy C4 | N06455 | 2.461 | B622/B619 | – |
| Alloy G-3 | N06985 | 2.4619 | B622/B619 | – |
| Alloy G30 | N06030 | – | B622/B619 | – |
| Alloy K500 (Monel) | N05500 | 2.4375 | – | B865 |
| Nickel 200 | N02200 | 2.4066 | B161/B725 | B564 |
| Nickel 201 | N02201 | 2.4068 | B161/B725 | – |
Nickel-Alloy Buttweld Fittings Chemical Composition
| Fe | C | Ni | Cr | Mo | Co | Cu | Mn | S | Si | W | V | P | Al | Ti | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nickel 200 | .40 max | .15 max | 99.0 min | .25 max | .35 max | .01 max | .35 max | ||||||||
| Nickel 201 | .40 max | .02 max | 99.0 min | .25 max | .35 max | .01 max | .35 max | ||||||||
| Hastelloy C276 | 4.0-7.0 | .01 max | Remainder | 14.5-16.5 | 15.0-17.0 | 2.5 max | 1.0 max | .03 max | .08 max | 3.0-4.5 | .35 max | .04 max | |||
| Inconel 600 | 6.0-10.0 | .15 max | 72.0 min* | 14.0-17.0 | .50 max | 1.00 max | .015 max | .50 max | |||||||
| Inconel 601 | 14 | 0.05 | 61.5 | 22.5 | 0.3 | 0.2 | 1.4 | ||||||||
| Inconel 625 | 5.0 max | .10 max | Remainder | 20.00-30.00 | 8.0-10.0 | 1.0 max** | .50 max | .015 max | .50 max | .015 max | .40 max | .40 max | |||
| Inconel 718 | Remainder | .08 max | 50.00-55.00 | 17.00-21.00 | 2.80-3.30 | 1.00 max | .30 max | .35 max | .015 max | .35 max | .015 max | .20-.80 | .65-1.15 | ||
| Incoloy 800 | 39.5 min | .10 max | 30.0-35.0 | 19.0-23.0 | .15-.60 | .15-.60 | |||||||||
| Incoloy 800H | 39.5 min | .05-.10 | 30.0-35.0 | 19.0-23.0 | .15-.60 | .15-.60 | |||||||||
| Incoloy 800HT | 39.5 min | .06-.10 | 30.0-35.0 | 19.0-23.0 | .25-.60 | .25-.60 | |||||||||
| Incoloy 825 | 22.0 min | 0.05 max | 38.0-46.0 | 19.5-23.5 | 1.5-3.0 | 1.0 max | 0.03 max | 0.5 max | 0.2 max | .6-1.2 | |||||
| Alloy 20 | Balance | .07max | 32.00-38.00 | 19.0-21.0 | 2.0-3.0 | 3.0-4.0 | 2.0max | .035max | 1.0max | .045max | |||||
| Monel K500 | 2.0 max | .25 max | 63.0-70.0 | Remainder | 1.5 max | .01 max | .50 max | 2.30-3.15 | .35-.85 |
Typical Applications for Nickel Alloy Materials (Oil & Gas)
| Nickel Alloy | Typical Application Area in Oil & Gas Engineering |
| Nickel 200/201 |
|
| Hastelloy C-276 |
|
| Monel K500 |
|
| Monel 400 |
|
| Incoloy 800H/HT |
|
| Incoloy 825 |
|
| Inconel 600 |
|
| Inconel 601 |
|
| Inconel 625 |
|
| Inconel 718 |
|
COATED, LINED AND CLAD FITTINGS
In some cases, buttweld fittings can be externally coated with protective materials, internally lined (example PTFE may be inserted to enhance the resistance of the bare metal to corrosive fluids) or clad (the picture shows a clad tee: the tee is made of carbon steel, but the inner side is covered by a higher grade material, stainless steel 316 in this case).
EUROPEAN VS ASTM BUTTWELD FITTINGS MATERIALS
The table shows the equivalent ASTM and European pipe fittings materials grades.
| Butt Weld Fittings Materials Comparison Chart | ||
|---|---|---|
| Werkstoff Number | European Grade | ASTM Grade |
| CARBON STEEL FITTINGS MATERIALS | ||
| 1.0254 St 37.0 | S235 | – |
| – – | – | – |
| 1.0305 St 35.8/I | P235GH (1.0345) | A 234 Grade WPA |
| 1.0305 St 35.8/III | P235GH (1.0345) | – |
| 1.0405 St 45.8/I | P265GH (1.0425) | A 234 Grade WPB |
| 1.0405 St 45.8/III | P265GH (1.0425) | – |
| ALLOY STEEL FITTINGS MATERIALS | ||
| 1.5415 15 Mo 3 | 16Mo3 | A 234 Grade WP1 |
| 1.7335 13 CrMo 4 4 | 13CrMo4-5 | A 234 Grade WP11, WP12 |
| 1.7380 10 CrMo 9 10 | 10CrMo9-10 | A 234 Grade WP22 |
| 1.7362 12 CrMo 19 5 | X11CrMo5 | A 234 Grade WP5 |
| – – | – | A 234 Grade WP9 |
| 1.4903 – | X10CrMoVNb9-1 | A 234 Grade WP91 |
| LOW-TEMPERATURE CARBON STEEL FITTINGS MATERIALS | ||
| 1.5637 10 Ni 14 | 12Ni14 | A 420 Grade WPL3 |
| 1.0356 TTSt 35 N | P215NL (1.0451) | – |
| 1.0356 TTSt 35 V | – | – |
| – – | – | A 420 Grade WPL6 |
| HIGH YIELD CARBON STEEL FITTINGS MATERIALS | ||
| – – | – | – |
| 1.0486 StE 285 | – | A860 Grade WPHY42 |
| 1.0562 StE 355 | P355N | A860 Grade WPHY52 |
| 1.8902 StE 420 | – | A860 Grade WPHY60 |
| 1.8905 StE 460 | – | A860 Grade WPHY70 |
| HIGH YIELD CARBON STEEL FITTINGS MATERIALS | ||
| 1.0457 StE 240.7 | – | – |
| 1.0484 StE 290.7 | L290NB | A860 Grade WPHY42 |
| 1.0582 StE 360.7 | L360NB | A860 Grade WPHY52 |
| 1.8972 StE 415.7 | L415NB | A860 Grade WPHY60 |
| – – | – | – |
| STAINLESS STEEL FITTINGS MATERIALS | ||
| 1.4541 X 6 CrNiTi 18 10 | X6CrNiTi18-10 | A 403 Grade WP321 |
| 1.4571 X 6 CrNiMoTi 17 12 2 | X6CrNiMoTi17-12-2 | A 403 Grade WP316Ti |
| 1.4301 X 5 CrNi 18 10 | X5CrNi18-10 | A 403 Grade WP304 |
| 1.4306 X 2 CrNi 19 11 | X2CrNi19-11 | A 403 Grade WP304L |
| 1.4307 – | X2CrNi18-9 | A 403 Grade WP304L |
| 1.4401 X 5 CrNiMo 17 12 2 | X5CrNiMo17-12-2 | A 403 Grade WP316 |
| 1.4404 X 2 CrNiMo 17 13 2 | X2CrNiMo17-12-2 | A 403 Grade WP316L |
| 1.4462 X 2 CrNiMoN 22 5 3 | X2CrNiMoN22-5-3 | UNS S 31803 (Duplex) |
| 1.4529 X 1 NiCrMoCuN 25 20 6 | X1NiCrMoCuN25-20-7 | UNS N 08926 |
| 1.4539 X 1 NiCrMoCuN 25 20 5 | X1NiCrMoCu25-20-5 | UNS N 08904 (904L) |
| 1.4547 – | X1CrNiMoCuN20-18-7 | UNS S 31254 |
One Response
we would like to thank you for such a good blog on different grade fittings
we deep steel alloys are stockist of Inconel 600 Fittings in grades of inconel 625, inconel 825, inconel 600, inconel 800, inconel 718 along with stockist and supplier of inconel, monel, hastelloy, titanium, high nickel alloy in form of flanges, pipe, plate,rod,coil,wire,round bar .
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