FORGED FITTINGS MATERIALS


Forged fittings are available in multiple material grades (carbon, alloy, stainless and nickel-alloy steels). In this article, we give an overview of the most common forged fittings materials, their chemical composition and, mechanical properties. At the bottom of the page, we show a useful chart to match pipe and fittings materials (wrought and forged fittings materials).


MATERIALS FOR FORGED FITTINGS

Carbon steel forged fittings materials

  • ASTM A105 Specification for Carbon Steel Forgings for Piping Applications
  • ASTMA181 Specification for Carbon Steel Forgings, for General-Purpose Piping
  • ASTM A350 Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components
  • ASTM A694 Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service

Alloy steel forged fittings materials

  • ASTM A182 Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
  • ASTM A350 Specification for Carbon and Low-Alloy Steel Forgings, Requiring Notch Toughness Testing for Piping Components
  • ASTM A694 Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service

Stainless steel forged fittings materials

  • ASTM A182 Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service

Nickel alloy forged fittings materials

  • ASTM B160 Specification for Nickel Rod and Bar
  • ASTM B164 Specification for Nickel-Copper Alloy Rod, Bar, and Wire
  • ASTM B166 Specification for Nickel-Chromium-Iron Alloys (UNS N06600, N06601, N06603, N06690, N06693, N06025, and N06045) and Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS N06617) Rod, Bar, and Wire
  • ASTM B462 Specification for Forged or Rolled UNS N06030, UNS N06022, UNS N06035, UNS N06200, UNS N06059, UNS N06686, UNS N08020, UNS N08024, UNS N08026, UNS N08367, UNS N10276, UNS N10665, UNS N10675, UNS N10629, UNS N08031, UNS *N06045, UNS N06025, and UNS R20033 Al
  • ASTM B564 Specification for Nickel Alloy Forgings

Copper and copper alloy forged fittings materials

  • ASTM B21 Specification for Naval Brass Rod, Bar, and Shapes
  • ASTM B98 Specification for Copper-Silicon Alloy Rod, Bar, and Shapes
  • ASTM B150 Specification for Aluminum Bronze Rod, Bar, and Shapes

Aluminum and Aluminium-alloy forged fittings materials

  • ASTM B247 Specification for Aluminum and Aluminum-Alloy Die Forgings, Hand Forgings, and Rolled Ring Forgings

Titanium and titanium alloy pipe forged fittings materials

  • ASTM B381 Specification for Titanium and Titanium Alloy Forgings

CARBON STEEL FITTINGS ASTM A105

CHEMICAL COMPOSITION AND MECHANICAL PROPERTIES OF ASTM FORGED FITTINGS MATERIALS

Chemical Composition, max (unless range is given), % Tensile Properties, min (unless range is given)
Material Grade Grade or Class C Si Mn S P Cu Ni Cr Mo V Cb/Nb Tensile Strength min, Ksi Yield Point
Ksi
Yield Strength
Ksi @ 0.2%
Elongation in 2 in, %
ASTM A105 0.35 0.10-0.35 0.60-1.05 0.040 0.035 0.40 0.40 0.30 0.12 0.08 70 36 22
ASTM A181 60 0.35 0.10-0.35 1.10 0.050 0.050 60 30 22
70 0.35 0.10-0.35 1.10 0.050 0.050 70 36 18
ASTM A266 1 0.30 0.15-0.35 0.40-1.05 0.025 0.025 60-85 30 23
2 0.30 0.15-0.35 0.40-1.05 0.025 0.025 70-95 36 20
3 0.35 0.15-0.35 0.80-1.35 0.025 0.025 70-95 36 20
4 0.30 0.15-0.35 0.80-1.35 0.025 0.025 75-100 37.5 19
ASTM A350 LF1 0.30 0.15-0.30 0.60-1.35 0.040 0.035 0.40 0.40 0.30 0.12 0.08 0.02 60-85 30 25
LF2-1 0.30 0.15-0.30 0.60-1.35 0.040 0.035 0.40 0.40 0.30 0.12 0.08 0.02 70-95 36 22
LF2-2 0.30 0.15-0.30 0.60-1.35 0.040 0.035 0.40 0.40 0.30 0.12 0.08 0.02 70-95 36 22
LF3-1 0.20 0.20-0.35 0.90 0.040 0.035 0.40 3.30-3.70 0.30 0.12 0.03 0.02 70-95 37.5 22
LF3-2 0.20 0.20-0.35 0.90 0.040 0.035 0.40 3.30-3.70 0.30 0.12 0.03 0.02 70-95 37.5 22
LF5-1 0.30 0.20-0.35 0.60-1.35 0.040 0.035 0.40 1.00-2.00 0.30 0.12 0.03 0.02 60-85 30 25
LF5-2 0.30 0.20-0.35 0.60-1.35 0.040 0.035 0.40 1.00-2.00 0.30 0.12 0.03 0.02 70-95 37.5 22
LF6-1 0.22 0.15-0.30 1.15-1.50 0.025 0.025 0.40 0.40 0.30 0.12 0.04-0.11 0.02 66-91 52 22
LF6-2 0.22 0.15-0.30 1.15-1.50 0.025 0.025 0.40 0.40 0.30 0.12 0.04-0.11 0.02 75-100 60 20
LF6-3 0.22 0.15-0.30 1.15-1.50 0.025 0.025 0.40 0.40 0.30 0.12 0.04-0.11 0.02 75-100 60 20
LF9 0.20 0.40-1.06 0.040 0.035 0.75-1.25 1.60-2.24 0.30 0.12 0.03 0.02 63-88 46 25
LF787-2 0.07 0.40 0.40-0.70 0.025 0.025 1.00-1.30 0.70-1.00 0.60-0.90 0.15-0.25 0.03 0.02 min 65-85 55 20
LF787-3 0.07 0.40 0.40-0.70 0.025 0.025 1.00-1.30 0.70-1.00 0.60-0.90 0.15-0.25 0.03 0.02 min 75-95 65 20

STAINLESS STEEL FITTINGS ASTM A182

ASTM A182 chemical composition, %
A182 Grade C Mn P S Si Ni Cr Mo Nb Ti Others
F304(1) 0.08 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
F304H 0.04-0.10 2.0 0.045 0.030 1.0 8.0-11.0 18.0-20.0
F304L(1) 0.030 2.0 0.045 0.030 1.0 8.0-13.0 18.0-20.0
F304N(2) 0.08 2.0 0.045 0.030 1.0 8.0-10.5 18.0-20.0
F304LN(2) 0.030 2.0 0.045 0.030 1.0 8.0-10.5 18.0-20.0
F309H 0.04-0.10 2.0 0.045 0.030 1.0 12.0-15.0 22.0-24.0
F310 0.25 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0
F310H 0.04-0.10 2.0 0.045 0.030 1.0 19.0-22.0 24.0-26.0
F310MoLN 0.030 2.0 0.030 0.015 0.40 21.0-23.0 24.0-26.0 2.0-3.0 N 0.10-0.16
F316 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0
F316H 0.04-0.10 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0
F316L(1) 0.030 2.0 0.045 0.030 1.0 10.0-15.0 16.0-18.0 2.0-3.0
F316N(2) 0.08 2.0 0.045 0.030 1.0 11.0-14.0 16.0-18.0 2.0-3.0
F316LN(2) 0.030 2.0 0.045 0.030 1.0 11.0-14.0 16.0-18.0 2.0-3.0
F316Ti 0.08 2.0 0.045 0.030 1.0 10.0-14.0 16.0-18.0 2.0-3.0 (3) N 0.10 max
F317 0.08 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
F317L 0.030 2.0 0.045 0.030 1.0 11.0-15.0 18.0-20.0 3.0-4.0
F321 0.08 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (4)
F321H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-12.0 17.0-19.0 (5)
F347 0.08 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (6)
F347H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (7)
F348 0.08 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (6) Co 0.20
Ta 0.10
F348H 0.04-0.10 2.0 0.045 0.030 1.0 9.0-13.0 17.0-20.0 (7) Co 0.20
Ta 0.10

Notes:

  1. Grades F304, F304L, F316, and F316L shall have a maximum Nitrogen of 0.10%.
  2. Grades F304N, F316N, F304LN, and F316LN shall have a Nitrogen of 0.10 to 0.16%.
  3. Grade F316Ti shall have a Titanium content five times above the Carbon plus Nitrogen and not more than 0.70%.
  4. Grade F321 shall have a Titanium content five times above the Carbon and not more than 0.70%.
  5. Grade F321H shall have a Titanium content four times above the Carbon and not more than 0.70%.
  6. Grades F347 and F348 shall have a Niobium content ten times above the Carbon and not more than 1.10%.
  7. Grades F347H and F348H shall have a Niobium content above than eight times the Carbon and not more than 1.10%.

The A182 specification from the ASTM website:

This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high-temperature service. After hot working, forgings shall be cooled to a specific temperature prior to heat treatment, which shall be performed in accordance with certain requirements such as heat treatment type, austenitizing/solution temperature, cooling media, and quenching. The materials shall conform to the required chemical composition for carbon, manganese, phosphorus, silicon, nickel, chromium, molybdenum, columbium, titanium. The material shall conform to the requirements as to mechanical properties for the grade ordered such as tensile strength, yield strength, elongation, Brinell hardness. All H grades and grade F 63 shall be tested for average grain size. 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”.

(source: ASTM)

 

PIPES AND FORGED FITTINGS MATERIALS MATING CHART

Materials Forged Fittings Materials Butt Weld Fittings Materials Pipe Materials
Carbon Steel A181-Gr.1 A181-Gr.2 A234-WPA WPB WPC
Moderate, high temp. service A105-Gr.1 A105-Gr.2 A106-Gr.B/API 5 LB
Low temp. service A350-LF1 A350-LF2 A420-WPL6 A33-Gr.6/A 671
Carbon -1/2 Moly Alloy Steel
High Temp Service A182-F1 A234-WP1
Low Temp Service
1/2Cr-1/2Mo Alloy Steel A182-F2
1/2Cr-1/2Mo-1 Alloy Steel
3/4Cr-1 Mo-3/4NI Alloy Steel
1Cr-1/2Mo Alloy Steel A182-F12 A234-WP12
1Cr-1 Mo-Vd Alloy Steel A404-F24
1-1/4Cr-1/2Mo Alloy Steel A182-F11 A234-WP11
1-1/4Cr-1/2Mo-Vd Alloy Steel
2-1/4Cr-1/2Mo-Vd Alloy Steel A182-F22 A234-WP22
3Cr-1 Mo Alloy Steel A182-F21
5Cr-1/2Mo Alloy Steel A182-F5 A234-WP5
5Cr-1/2Mo-Si Alloy Steel
7Cr-1/2Mo Alloy Steel A182-F7 A234-WP7
9Cr-1 Mo Alloy Steel A182-F9 A234-WP9
13Cr Alloy Steel A182-F6
Stainless Steel 304
Standard A182-F304 A403-WP304 A312-TP304
Low Carbon A182-F304-L A403-WP304-L A312-Tp304L
High Temp Service A182-F304-H A403-WP304-H A312-TP304H
Type 309 Stainless Steel A403-WP309
Type 310 Stainless Steel A182-F310 A403-WP310 A312-TP310
Type 316 Stainless Steel
Standard A182-F316 A403-WP316 A312-TP316
Low Carbon A182-F316-L A403-WP316-L A312-TP316L
High Temp Service A182-F316-H A403-WP316-H A312-TP316H
Type 317 Stainless Steel
Type 321 Stainless Steel
Standard A182-F321 A403-WP321
High Temp Service A182-F321-H A403-WP321-H
Type 347 Stainless Steel
Standard A182-F347 A403-WP347
High Temp Service A182-F347-H A403-WP347-H
Type 348 Stainless Steel
Standard A182-F348 A403-WP348
High Temp Service A182-F348-H
20 Ni-8 Cr Alloy A182-F10
2 Nickel Alloy Steel
Low Temp Service