Lap Joint Flange
Loose ring lap joint flanges combined with stub ends, easy to install and align, available in carbon steel, stainless steel and alloy steel per international standards.
ASTM A694 Specification for Carbon and Alloy Steel Forgings for Pipe Flanges, Fittings, Valves, and Parts for High-Pressure Transmission Service
ASTM A694 is the standard specification for carbon and alloy steel forgings for pipe flanges, fittings, valves, and parts for high-pressure transmission service, designed for use with high-strength transmission-service pipe.
Nine grades are specified, all within our supply capability: F42, F46, F48, F50, F52, F56, F60, F65, F70. All grades shall be suitable for field welding and shall be free of weld repair. A694 components are widely used in oil & gas wellhead systems, offshore drilling platforms, and long-distance high-pressure pipelines.
1.1 This specification covers forged or rolled steel pipe flanges, forged fittings, valves, and parts suitable for use with high-strength transmission-service pipe. Included are flanges, fittings, and similar parts ordered to purchaser dimensions or to ASME / MSS dimensional standards.
1.2 Several grades are covered, based on minimum yield strength (see Table 1).
1.3 Supplementary Requirements are provided. S1 applies when purchaser approval
is required for repair welding.
1.4 This specification is expressed in both inch-pound and SI units.
Unless the order specifies the “M” designation, material shall be furnished
to inch-pound units.
1.5 Values in each system are independent standards.
Combining values may result in nonconformance.
ASTM A694 F65 Weld Neck Flanges, 16″ RTJ 600# SCH80, MSS SP-44.
ASME B16.11 Forged Tee 3000# NPT, ASTM A694 F52, Galvanized.
| Grade | Yield Strength (0.2% offset), min (ksi [MPa]) |
Tensile Strength, min (ksi [MPa]) |
Elongation in 2 in (50 mm), min (%) |
|---|---|---|---|
| F42 | 42 [290] | 60 [415] | 20 |
| F46 | 46 [315] | 60 [415] | 20 |
| F48 | 48 [330] | 62 [420] | 20 |
| F50 | 50 [345] | 64 [440] | 20 |
| F52 | 52 [360] | 66 [455] | 20 |
| F56 | 56 [385] | 68 [470] | 20 |
| F60 | 60 [415] | 75 [515] | 20 |
| F65 | 65 [450] | 77 [530] | 20 |
| F70 | 70 [485] | 82 [565] | 18 |
This standard is available in both inch-pound and SI (metric) units. Material shall be supplied in inch-pound units unless the “M” designation is specified in the order.
Materials shall comply with ASTM A961 and the additional requirements of the purchase order. Nonconformance with A961/A961M shall be considered nonconformance with ASTM A694. Where conflicts exist, this specification shall prevail.
Steel shall be produced by open hearth, electric furnace, or oxygen top-blown converter, and shall be fully deoxidized. Material may be carbon steel, HSLA steel, or alloy steel, subject to agreement. Chemical composition shall be reported. Products shall be suitable for welding to ASTM A53, A106, A381, API 5L pipes or MSS SP-75 fittings.
Forgings shall be produced from ingots, billets, slabs, or rolled bars, and cut to length by appropriate processes. Hot working shall develop a fully wrought structure. Flanges shall not be machined directly from plate or solid bar stock.
All forgings shall be heat treated.
Carbon and HSLA steels shall be normalized, normalized and tempered,
or quenched and tempered.
Alloy steels shall be precipitation hardened.
Tempering temperature shall be ≥ 1000°F [540°C];
precipitation heat treatment shall be performed between
1000–1225°F [540–665°C].
| Element | Composition, % (Heat Analysis) |
|---|---|
| Carbon, max | 0.30 |
| Manganese, max | 1.60 |
| Phosphorus, max | 0.025 |
| Sulfur, max | 0.025 |
| Silicon | 0.15–0.35 |
| Copper | Report |
| Nickel | Report |
| Chromium | Report |
| Molybdenum | Report |
| Vanadium | Report |
| Columbium (Niobium) | Report |
Note: All listed elements shall be reported. Where no limit is given, values are for information only, except as required by A707/A707M Grade L5 for alloy steel.
Tensile testing shall be performed in accordance with ASTM A961. Mechanical properties shall conform to Table 1. Forgings shall be free from injurious defects defined in A961.
Rejection and rehearing shall be conducted in accordance with ASTM A961/A961M requirements.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
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