ASTM A105 Forged Carbon Steel Flanges Manufacturer & Supplier
Metinox Overseas is a leading ASTM A105 flanges manufacturer and supplier. ASME SA105 Forged Flanges are quality manufactured using controlled carbon steel chemical composition comprising of carbon (max 0.35%), manganese (0.60-1.05%), and silicon (0.10-0.35%) and provide our best tensile strength of 485 Mpa and Yield strength of 250 Mpa. The flanges are made of Carbon Steel A105, specifically aimed at ambient and high temperature service between -29-C (-20-F) and 427-C (800-F) to be suitable in crude oil pipelines, the natural gas processing system, refinery piping systems, steam lines, and the overall industrial use.
The counterfeit manufacturing process guarantees better grain flow, integrity, and mechanical strength of the flange body. Our A105 Weld Neck Flanges, Slip-On Flanges, Blind Flanges and Socket Weld Flanges are made to the dimensional requirements set by ANSI/ASME B16.5 (1/2 to 24 NB) and ASME B16.47 Series A and B (26 to 60 NB) in their pressure classes (150 to 2500 NB). The flanges are put through strict quality tests consisting of dimensional inspection, PMI testing, hardness testing, hydrostatic testing and ultrasonic testing as required by ASTM A961 and heat treatment optional except when indicated to relieve stress.
Table of Contents
- ASTM A105 Flanges Technical Specifications
- ASTM A105 Equivalent Grades
- ASTM A105 Chemical Composition
- Mechanical Properties of ASTM A105 Flanges
- ASTM A105 Flange Dimensions & Pressure Rating Chart
- Types of ASTM A105 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is ASTM A105 Good Quality for Industrial Applications?
- Heat Treatment & Testing Requirements
- ASTM A105 Carbon Steel Flanges Price List 2026
- Applications of ASTM A105 Flanges in Industry
- Why Choose ASTM A105 Flanges from Metinox Overseas?
- ASTM A105 Flange Delivery Time & CIF Pricing by Country
- Other Types of Carbon Steel A105 Flanges
- Popular Locations Where We Supply ASTM A105 Flanges
- Frequently Asked Questions (FAQ)
ASTM A105 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM A105 / ASME SA105 / MSS SP-44 |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, API 605, MSS SP-44 |
| Size Range | 1/2" (15 NB) to 60" (1500 NB) |
| Pressure Class | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# (B16.5); 75#, 150#, 300#, 400#, 600#, 900# (B16.47) |
| Grade | A105 (single grade specification) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Orifice, Long Weld Neck, Reducing |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Forged, Ring Rolled (for large diameter) |
| Heat Treatment | Optional - Normalizing, Stress Relieving (as specified) |
| Testing | Hydrostatic Test, PMI Test, Hardness Test, Ultrasonic Test, Radiography |
| Inspection | Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS |
| Certifications | EN 10204 3.1B MTC, NACE MR0175, PED 2014/68/EU, CE Marked, API 6A, ASME B31.3 |
ASTM A105 Equivalent Grades
| Standard | USA | Germany | France | Japan | India | UK | China |
| CS A105 | ASTM A105 / ASME SA105 | 1.0460 / C22.8 | A 48 CP | SF 490A | IS 2062 | BS 1503-161 | 20# |
ASTM A105 Chemical Composition
The detailed composition of this material is given in the following table.
| Element | Composition (%) | Function |
| Carbon (C) | 0.35 max | Provides strength, controlled for weldability |
| Manganese (Mn) | 0.60 - 1.05 | Enhances strength and toughness |
| Phosphorus (P) | 0.035 max | Controlled for improved ductility |
| Sulfur (S) | 0.040 max | Minimized to prevent hot cracking |
| Silicon (Si) | 0.10 - 0.35 | Acts as deoxidizer, improves strength |
| Copper (Cu) | 0.40 max | Corrosion resistance |
| Nickel (Ni) | 0.40 max | Toughness enhancement |
| Chromium (Cr) | 0.30 max | Controlled for weldability |
| Molybdenum (Mo) | 0.12 max | Strength at elevated temperatures |
| Vanadium (V) | 0.08 max | Grain refinement |
Note: Sum of Cr + Cu + Mo + Ni + V = 1.00%. Carbon content higher than A350 LF2, optimized for ambient to elevated temperature service.
Mechanical Properties of ASTM A105 Flanges
The mechanical properties decide the shelflife of the material. The table below gives the information about the mechanical properties of ASTM A105 Flanges.
| Property | Requirement | Testing Standard |
| Tensile Strength | 485 MPa (70 ksi) minimum | ASTM A370 |
| Yield Strength (0.2% offset) | 250 MPa (36 ksi) minimum | ASTM A370 |
| Elongation in 2" | 22% minimum | ASTM A370 |
| Reduction of Area | 30% minimum | ASTM A370 |
| Hardness (Brinell) | 137-197 HB (typical) | ASTM E10 |
| Impact Testing | Not required (optional for low-temp service) | ASTM A370 |
ASTM A105 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for Carbon Steel A105 Flanges
| Temperature -F (-C) | Class 150 | Class 300 | Class 600 | Class 900 | Class 1500 | Class 2500 |
|---|---|---|---|---|---|---|
| -20 to 100 (-29 to 38) | 285 psi | 740 psi | 1480 psi | 2220 psi | 3705 psi | 6170 psi |
| 200 (93) | 260 psi | 675 psi | 1350 psi | 2025 psi | 3375 psi | 5625 psi |
| 300 (149) | 230 psi | 655 psi | 1315 psi | 1970 psi | 3280 psi | 5470 psi |
| 400 (204) | 200 psi | 635 psi | 1270 psi | 1900 psi | 3170 psi | 5280 psi |
| 500 (260) | 170 psi | 600 psi | 1200 psi | 1795 psi | 3000 psi | 4995 psi |
| 600 (316) | 140 psi | 550 psi | 1095 psi | 1640 psi | 2735 psi | 4560 psi |
| 650 (343) | 125 psi | 535 psi | 1075 psi | 1610 psi | 2685 psi | 4480 psi |
| 700 (371) | 110 psi | 535 psi | 1075 psi | 1610 psi | 2685 psi | 4480 psi |
| 750 (399) | 95 psi | 505 psi | 1010 psi | 1515 psi | 2530 psi | 4215 psi |
| 800 (427) | 80 psi | 410 psi | 825 psi | 1230 psi | 2055 psi | 3430 psi |
Types of ASTM A105 Flanges Available
Reducing Flange
Lap Joint Flange
Long Weld Neck Flange
Spectacle Blind Flange
Threaded Flange
Orifice Flange
Socket Weld Flange
Weld Neck Flange
Blind Flange
Slip-On Flange
Standard Flange Sizes & Weight Chart
ASTM A105 Weld Neck Flange Dimensions (ANSI B16.5) - Class 150 Sample
| NPS | Outside Diameter (mm) | Thickness (mm) | Bore (mm) | Hub Dia (mm) | Bolt Circle (mm) | No. of Bolts | Bolt Dia | Approx Weight (kg) |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 90 | 11 | 21 | 35 | 60 | 4 | M12 | 0.45 |
| 1" | 108 | 13 | 33 | 50 | 79 | 4 | M12 | 0.86 |
| 2" | 152 | 16 | 60 | 75 | 121 | 4 | M16 | 1.80 |
| 4" | 229 | 19 | 114 | 127 | 190 | 8 | M16 | 5.40 |
| 6" | 267 | 21 | 168 | 184 | 229 | 8 | M19 | 8.60 |
| 8" | 330 | 24 | 219 | 238 | 286 | 8 | M19 | 14.5 |
| 10" | 406 | 27 | 273 | 305 | 362 | 12 | M22 | 24.0 |
| 12" | 483 | 29 | 324 | 346 | 432 | 12 | M22 | 36.0 |
| 16" | 597 | 32 | 419 | 448 | 546 | 16 | M25 | 64.0 |
| 20" | 699 | 38 | 508 | 559 | 648 | 20 | M25 | 98.0 |
| 24" | 813 | 44 | 610 | 651 | 756 | 20 | M32 | 150.0 |
Is ASTM A105 Good Quality for Industrial Applications?
Yes, ASTM A105 is the most popular carbon steel specification in the oil and gas industry around the globe based on forged flanges. It is the standard of ambient and elevated temperature service to 427-C (800-F), and is an excellent compromise of mechanical properties, weldability, and cost-effectiveness. The low level of carbon (max 0.35%) used in conjunction with manganese and silicon gives sufficient strength and good weldability in most applications without the use of preheat.
A105 flanges offer tensile strengths of 485 Mpa and yield strengths of 250 Mpa which is enough to suit high pressure piping system in refineries, petrochemical and power plants. The fabricated manufacturing method gives high performance of the grain flow over cast materials leading to high mechanical performance and load cycles and thermal stresses.
Although A105 cannot be used in cryogenic service below -29-C (use of A350 LF2 is required) it is well suited in the typical industrial temperature service and can be used in the ASME B31.1, B31.3 and B31.4 piping codes. There is no mandatory impact testing required by the specification, and so it is less expensive than low-temperature grades, but impact testing may be specified when necessary regarding critical applications or project requirements.
Heat Treatment & Testing Requirements
| Heat Treatment Process | Details |
| As-Forged Condition | Standard delivery, no heat treatment required |
| Normalizing | Optional - Heating to 900-950-C, air cooling (improves grain structure) |
| Stress Relieving | Optional - 550-650-C when specified for critical service |
| Annealing | Not typically required unless specified |
| Testing Requirements | Details |
| Hydrostatic Testing | Per ASTM A961 or MSS SP-44 |
| Hardness Testing | Brinell hardness verification |
| PMI Testing | Positive Material Identification for chemical verification |
| Ultrasonic Testing | For critical applications per ASTM A388 |
| Dimensional Inspection | 100% verification per ANSI/ASME B16.5 |
| Impact Testing | Optional (required when specified for low-temperature service) |
ASTM A105 Carbon Steel Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $5 - $15 |
| Weld Neck (WN) | 4" - 8" | 150# | $18 - $85 |
| Weld Neck (WN) | 10" - 24" | 150# | $120 - $480 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $8 - $22 |
| Weld Neck (WN) | 4" - 8" | 300# | $32 - $145 |
| Weld Neck (WN) | 10" - 24" | 300# | $185 - $680 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $12 - $35 |
| Weld Neck (WN) | 4" - 8" | 600# | $58 - $225 |
| Slip-On (SO) | 1/2" - 2" | 150# | $4 - $12 |
| Slip-On (SO) | 4" - 8" | 150# | $15 - $65 |
| Slip-On (SO) | 10" - 24" | 150# | $85 - $380 |
| Blind (BL) | 1/2" - 2" | 150# | $3 - $10 |
| Blind (BL) | 4" - 8" | 150# | $16 - $70 |
| Blind (BL) | 10" - 24" | 150# | $95 - $420 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $6 - $28 |
| Threaded (TH) | 1/2" - 2" | 150# - 300# | $5 - $22 |
Note: A105 flanges are the most economical carbon steel option. Prices vary based on size, pressure class, quantity, and market conditions.
Applications of ASTM A105 Flanges in Industry
The ASTM A105 Carbon Steel Flanges are commonly used in many industrial applications, and some of the common industries are given below.
Oil & Gas
Crude oil pipes, natural gas transportation, well head equipment, collection systems.
Refineries
Process piping, distillation columns, heat exchangers, pump connections.
Petrochemical
Processing lines, reactor vessels, separators, connections of storage tanks.
Power Generation
Steam piping, boiler feed water, condensate lines, turbine piping.
Chemical Processing
Acid work (coating) service, caustic service, general process piping.
Water Treatment
Desalination plants, high-pressure water systems, water treatment on municipal water distribution.
HVAC Systems
Steam heating, hot water, district heating networks.
Food & Beverage
Process piping, steam systems, CIP lines (properly coated).
Pulp and Paper
Black Liquors, Recovery Boilers, Process Steam Systems.
Mining
Slurry pipelines, process water systems, tailings management.
Why Choose ASTM A105 Flanges from Metinox Overseas?
Metinox Overseas is a company that produces high-quality ASTM A105 flanges that are fully traceable, certified and offered at competitive prices supported by 15 years of manufacturing history. We have certified facilities on ISO 9001:2015 with a huge ready stock of A105 flanges ranging 1/2-48" NB in all pressures classes and therefore can deliver on the urgent projects in a short period of time. Each flange is supplied with EN 10204 3.1B Mill Test Certificates, dimensional inspection reports, PMI test certificates and hardness test results.
We offer support of third-party inspection with TUV, SGS, DNV GL, Lloyds Register and Bureau Veritas, and NACE MR0175 compliance with sour service applications on request. Our technical team is a source of expertise in ensuring that the material used is of the right type, code compliance (ASME B31.1, B31.3, B31.4, B31.8), and application engineering. Having the possibility to manufacture custom sizes, special facings, and fast production, we can offer our customers CIF/FOB delivery, as well as full after-sales service in more than 60 countries.
ASTM A105 Flange Delivery Time & CIF Pricing by Country
| Destination Region | Major Ports / Cities | Estimated Delivery Time | Typical CIF Terms |
|---|---|---|---|
| Middle East (GCC) | Dubai, Dammam, Doha, Muscat, Kuwait, Bahrain | 7-12 Days | CIF Dubai / CIF Dammam |
| Europe | Rotterdam, Hamburg, Antwerp, Southampton, Felixstowe | 22-28 Days | CIF Rotterdam / CIF Hamburg |
| USA & Canada | Houston, New York, Los Angeles, Vancouver, Montreal | 28-35 Days | CIF Houston / CIF New York |
| Southeast Asia | Singapore, Port Klang, Manila, Jakarta, Bangkok | 12-18 Days | CIF Singapore / CIF Port Klang |
| Africa | Lagos, Durban, Mombasa, Alexandria, Abidjan | 18-25 Days | CIF Lagos / CIF Durban |
| South America | Santos, Buenos Aires, Callao, Cartagena | 32-40 Days | CIF Santos / CIF Buenos Aires |
| Australia | Melbourne, Sydney, Brisbane, Perth | 25-32 Days | CIF Melbourne / CIF Sydney |
Other Types of Carbon Steel A105 Flanges
ASTM A105 Forged Flanges, Carbon Steel A105 Weld Neck Flanges, CS A105 Slip-On Flanges, ASME SA105 Blind Flanges, A105 Socket Weld Flanges, A105 Threaded Flanges, ANSI B16.5 A105 Lap Joint Flanges, A105 Orifice Flanges, A105 Long Weld Neck Flanges, ASTM A105 Reducing Flanges, A105 Spectacle Blind Flanges, A105 Class 150 Flanges, A105 Class 300 Flanges, A105 Class 600 Flanges, A105 RTJ Flanges, A105 SORF Flanges, A105 WNRF Flanges.
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Frequently Asked Questions (FAQ)
A105N will indicate normalized heat treatment where A105 can be in as-forged condition or in the normalized state. A105N contains superior grain structure and mechanical characteristics and is often oriented towards important usage. Both of them fulfill identical chemical and mechanical requirements.
The lowest and highest rated limit of A105 flanges are -29-C (-20-F) to 427-C (800-F) respectively according to ASME B16.5. Low-temperature carbon steel of A350 LF2 should be used in low temperatures, which are less than -29-C. There must be alloy steel A182 F11/F22 above 427-C.
Heat treatment Standard A105 flanges that can be supplied in the as-forged form do not need heat treatment. However, normalization may be ordered to obtain further grain structure, stress relieving may be necessary when the project requires a critical service or extreme wall thickness.
A105 has a higher amount of carbon (peak carbon is 0.35% compared to 0.26%), and is employed in ambient temperatures (-29-C to 427-C). A350 LF2 has also minimized carbon to provide superior low-temperature toughness (-46-C minimum) and mandatory Charpy impact testing and therefore can also be used in applications involving cryogenic service.
Yes, A105 was easily welded with the help of SMAW (E7018), GMAW (ER70S-6) or GTAW and without any preheat and up to the thickness of 25mm. It is recommended to preheat in thicker sections to 95-120-C. It might be necessary to do code requirements that mandate the heat treatment of pressure vessels, which has to be performed immediately after welding.
Yes, every shipment will contain EN 10204 3.1B MTC of the actual chemical composition, tensile test data, hardness data, traceability of heat number and manufacturing information. Others like NACE MR0175, PED and API 6A are under order.
A105 may be operated in steam service to a maximum of 427-C (800-F). It can typically be used on ASME B31.1 power piping, boiler feed water, superheated steam and condensate systems. According to the ASME table B16.5, pressure ratings decrease with the temperature.
The highest pressure corresponds to the size and temperature. Class 2500 at ambient temperature offers 6170 psi of NPS =1. Class 2500 rating is also 3430 psi at 427-C (800-F). See tables of ASME B16.5 pressure-temperature rating under special use.
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