ASTM A516 Grade 70 High Strength Pressure Vessel Flanges Manufacturer & Supplier
The Metinox Overseas is the major producer and supplier of the ASTM A516 Grade 70 Carbon Steel Flanges, which is the best grade in pressure vessel and boiler application, which needs high strength and good notch toughness in moderate and lower temperature service. Our ASME SA516 Grade 70 Flanges are produced of high-quality pressure vessel quality (PVQ) carbon steel with controlled chemical composition of carbon (max 0.30%), manganese (0.79-1.30%), and silicon (0.13-0.45) and with minimum tensile strength of 485 Mpa and yield strength of 260 Mpa. These High Strength A516 Gr 70 Flanges have been created with the specific focus on the demanding pressure vessel operations, storage tanks, boiler construction that can operate under -29-C -20-F all the way up to very high temperatures, ideal to use in ASME Section VIII pressure vessels, API 650/620 storage tanks, heat exchangers, process vessels, and critical petrochemical equipment.
The finer austenitic grain structure; enhanced levels of strength thus yield better resistance to brittle fracture and high performance in cyclic loading and thermal stress. ASTM A516 Grade 70 Weld Neck Flanges, Slip-On Flanges, Blind Flanges and Spectacle Blind Flanges are produced to ANSI/ASME B16.5 (1/2 to 24 inch NB) and ASME B16.47 Series A and B (26 to 60 inch NB) dimensional requirements in pressure classes ranging between 150 -2500 pound. All flanges are rigorously tested with respect to quality as dimensional inspection, PMI, tensile test, ultrasonic test as per ASTM A20/A961 requirements, and a normalized heat treatment is obligatory when the thickness is greater than 38mm (1.5 inches).
Table of Contents
- ASTM A516 Grade 70 Flanges Technical Specifications
- ASTM A516 Grade 70 Equivalent Grades
- ASTM A516 Grade 70 Chemical Composition
- Mechanical Properties of ASTM A516 Grade 70 Flanges
- ASTM A516 Grade 70 Flange Dimensions & Pressure Rating Chart
- Types of ASTM A516 Grade 70 Flanges Available
- Standard Flange Sizes & Weight Chart
- Is ASTM A516 Grade 70 Good Quality for Critical Pressure Vessels?
- Heat Treatment & Testing Requirements
- ASTM A516 Grade 70 Carbon Steel Flanges Price List 2026
- Applications of ASTM A516 Grade 70 Flanges in Industry
- Why Choose ASTM A516 Grade 70 Flanges from Metinox Overseas?
- ASTM A516 Grade 70 Flange Delivery Time & CIF Pricing by Country
- Other Types of High Strength A516 Gr 70 Flanges
- Popular Locations Where We Supply ASTM A516 Grade 70 Flanges
- Frequently Asked Questions (FAQ)
ASTM A516 Grade 70 Flanges Technical Specifications
| Feature | Details |
| Specifications | ASTM A516 / ASME SA516 / MSS SP-44 |
| Grade | Grade 70 (highest strength in A516 series) |
| 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) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint, Threaded, Spectacle Blind, Orifice, Reducing |
| Flange Face | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female, Tongue & Groove |
| Manufacturing Type | Forged from Plate, Ring Rolled (for large diameter) |
| Steel Type | Killed Steel, Fine Austenitic Grain Size |
| Heat Treatment | As-Rolled (<38mm), Normalized (>38mm or as specified) |
| Testing | Tensile Test, Hardness Test, PMI Test, Ultrasonic Test, Hydrostatic Test, Optional Impact Test |
| Inspection | Third Party Inspection by TUV, SGS, Bureau Veritas, Lloyd's, DNV GL, BV, ABS |
| Certifications | EN 10204 3.1B MTC, ASME Section VIII, PED 2014/68/EU, CE Marked, API 650, API 620, NACE MR0175 |
ASTM A516 Grade 70 Equivalent Grades
| Standard | USA | Germany | Europe | Japan | India | UK | China |
| A516 Gr 70 | ASTM A516 Gr 70 ASME SA516 Gr 70 | 1.0570 P355GH | P355GH EN 10028-2 | SB480 490B JIS G3103 | IS 2002 Gr 3 | BS 1501-161 Gr 490B | Q345R GB 713 |
ASTM A516 Grade 70 Chemical Composition
The detailed composition of this material is given in the following table.
| Element | Composition (%) | Function |
| Carbon (C) | 0.30 max (plates =12.5mm) 0.31 max (plates >12.5mm) |
Strength, controlled for weldability and toughness |
| Manganese (Mn) | 0.79 - 1.30 | Strength enhancement, deoxidation, improved notch toughness |
| Phosphorus (P) | 0.035 max | Controlled for ductility and toughness |
| Sulfur (S) | 0.035 max | Minimized to prevent hot cracking and improve toughness |
| Silicon (Si) | 0.13 - 0.45 | Deoxidizer, improves strength and soundness |
| Copper (Cu) | Not specified | Optional, typically <0.40% |
| Nickel (Ni) | Not specified | Optional, typically <0.40% |
| Chromium (Cr) | Not specified | Optional, typically <0.30% |
| Molybdenum (Mo) | Not specified | Optional, typically <0.12% |
Note: For each 0.01% reduction below specified max carbon, Mn may be increased 0.06% above specified max, up to 1.50% maximum. Grade 70 has the highest carbon content among A516 grades for maximum strength.
Mechanical Properties of ASTM A516 Grade 70 Flanges
The mechanical properties decide the shelflife of the material. The table below gives the information about the mechanical properties of ASTM A516 Grade 70 Flanges.
| Property | Requirement | Testing Standard |
| Tensile Strength | 485-620 MPa (70-90 ksi) | ASTM A370 |
| Yield Strength (0.2% offset) | 260 MPa (38 ksi) minimum | ASTM A370 |
| Elongation in 2" | 17% minimum (plates =12.5mm) 19% minimum (plates 12.5-19mm) 21% minimum (plates 19-38mm) 23% minimum (plates 38-50mm) |
ASTM A370 |
| Elongation in 8" | 15% minimum (plates =12.5mm) 17% minimum (plates >12.5mm) |
ASTM A370 |
| Hardness (Brinell) | 163-217 HB (typical) | ASTM E10 |
| Charpy V-Notch Impact | Optional (minimum 20 J at specified temp when required) | ASTM A370 |
| Reduction of Area | Not specified (typically >35%) | ASTM A370 |
ASTM A516 Grade 70 Flange Dimensions & Pressure Rating Chart
Pressure-Temperature Ratings for A516 Grade 70 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 |
Note: Same pressure ratings as A105/A516 Gr 60 per ASME B16.5, but with higher material strength reserve for critical applications.
Types of ASTM A516 Grade 70 Flanges Available
ASTM A694 F42 Orifice Flange
ASTM A516 Grade 70 Threaded Flange
ASTM A516 Grade 70 Reducing Flange
ASTM A516 Grade 70 Lap Joint Flange
ASTM A516 Grade 70 Long Weld Neck Flange
ASTM A516 Grade 70 Spectacle Blind Flange
ASTM A516 Grade 70 Socket Weld Flange
ASTM A516 Grade 70 Weld Neck Flange
ASTM A516 Grade 70 Blind Flange
ASTM A516 Grade 70 Slip-On Flange
Standard Flange Sizes & Weight Chart
ASTM A516 Grade 70 Weld Neck Flange Dimensions (ANSI B16.5) - Class 300 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" | 95 | 14 | 21 | 38 | 66 | 4 | M12 | 0.65 |
| 1" | 124 | 16 | 33 | 54 | 89 | 4 | M16 | 1.35 |
| 2" | 165 | 19 | 60 | 79 | 127 | 8 | M16 | 2.85 |
| 4" | 254 | 24 | 114 | 137 | 200 | 8 | M19 | 8.60 |
| 6" | 318 | 29 | 168 | 197 | 254 | 12 | M22 | 17.2 |
| 8" | 381 | 32 | 219 | 251 | 305 | 12 | M22 | 28.5 |
| 10" | 445 | 35 | 273 | 320 | 370 | 16 | M25 | 42.0 |
| 12" | 521 | 38 | 324 | 362 | 438 | 20 | M25 | 64.0 |
| 16" | 648 | 46 | 419 | 473 | 560 | 20 | M32 | 115.0 |
| 20" | 775 | 51 | 508 | 584 | 673 | 24 | M32 | 180.0 |
| 24" | 915 | 57 | 610 | 681 | 787 | 24 | M38 | 275.0 |
Is ASTM A516 Grade 70 Good Quality for Critical Pressure Vessels?
Yes, ASTM A516 Grade 70 is the premium grade within the A516 specification, offering the highest strength and best overall performance for critical pressure vessel applications. With minimum tensile strength of 485 MPa (70 ksi) and yield strength of 260 MPa (38 ksi), Grade 70 provides approximately 18% higher strength than Grade 60, allowing for reduced wall thickness in pressure vessel design while maintaining safety margins per ASME Section VIII Division 1 and 2.
The higher strength combined with fine austenitic grain size and killed steel practice delivers exceptional notch toughness and resistance to brittle fracture, making Grade 70 the preferred choice for demanding applications in oil and gas, petrochemical, and power generation industries. The material's fine-grain microstructure enhances crack resistance, weldability, and performance under cyclic loading and thermal cycling conditions commonly encountered in pressure vessels.
Grade 70 is specifically designed for lower-temperature service where superior toughness is critical. While the minimum design metal temperature (MDMT) per ASME Section VIII is -29-C (-20-F) without impact testing, Grade 70's inherent toughness provides greater safety margins than lower grades. The material is approved for ASME Section VIII Division 1 and 2, API 650 atmospheric storage tanks, and API 620 low-pressure storage tanks, making it the industry standard for critical pressure vessel fabrication.
The excellent weldability combined with higher strength makes Grade 70 ideal for thick-wall pressure vessels, high-pressure applications, and vessels subject to severe operating conditions. For projects requiring both strength and toughness with excellent fabricability, A516 Grade 70 represents the optimal balance of properties within the carbon steel pressure vessel material family.
Heat Treatment & Testing Requirements
| Category | Parameter | Requirement / Description |
|---|---|---|
| Heat Treatment | As-Rolled Condition | Standard delivery for plates = 38 mm (1.5") thickness |
| Normalized Condition | Mandatory for plates > 38 mm (1.5") thickness | |
| Heating Temperature | 900-950-C (1650-1740-F) | |
| Cooling Method | Uniform air cooling to room temperature | |
| Stress Relieving | Optional when specified, typically 550-650-C | |
| PWHT | Post-weld heat treatment as per ASME Section VIII requirements | |
| Testing Requirements (Per ASTM A20) | Tensile Testing | As per ASTM A370 - Yield Strength, Tensile Strength, Elongation (Mandatory) |
| Hardness Testing | Brinell hardness verification on each heat | |
| PMI Testing | Positive Material Identification for grade and chemistry verification | |
| Ultrasonic Testing | As per ASTM A435 or ASTM A578, when Supplementary Requirement S8 or S12 is specified | |
| Drop Weight Test | Optional, per Supplementary Requirement S6 for brittle fracture evaluation | |
| Charpy V-Notch Impact Test | Optional for low-temperature service or critical applications | |
| Simulated PWHT | Optional, per Supplementary Requirement S3 | |
| Product Analysis | Chemical verification per Supplementary Requirement S2 | |
| Vacuum Treatment | Optional, per Supplementary Requirement S1 |
ASTM A516 Grade 70 Carbon Steel Flanges Price List 2026
| Flange Type | Size Range | Pressure Class | Indicative Price Range (USD/Piece) |
|---|---|---|---|
| Weld Neck (WN) | 1/2" - 2" | 150# | $7 - $20 |
| Weld Neck (WN) | 4" - 8" | 150# | $25 - $105 |
| Weld Neck (WN) | 10" - 24" | 150# | $165 - $620 |
| Weld Neck (WN) | 1/2" - 2" | 300# | $11 - $29 |
| Weld Neck (WN) | 4" - 8" | 300# | $42 - $185 |
| Weld Neck (WN) | 10" - 24" | 300# | $250 - $880 |
| Weld Neck (WN) | 1/2" - 2" | 600# | $16 - $42 |
| Weld Neck (WN) | 4" - 8" | 600# | $72 - $275 |
| Weld Neck (WN) | 10" - 24" | 600# | $350 - $1,280 |
| Slip-On (SO) | 1/2" - 2" | 150# | $6 - $16 |
| Slip-On (SO) | 4" - 8" | 150# | $20 - $80 |
| Slip-On (SO) | 10" - 24" | 150# | $120 - $480 |
| Blind (BL) | 1/2" - 2" | 150# | $5 - $14 |
| Blind (BL) | 4" - 8" | 150# | $22 - $85 |
| Blind (BL) | 10" - 24" | 150# | $145 - $580 |
| Spectacle Blind | 2" - 24" | 150# - 600# | $18 - $750 |
| Socket Weld (SW) | 1/2" - 2" | 150# - 600# | $9 - $35 |
Note: A516 Gr 70 flanges are typically 8-12% higher than Gr 60 and 12-18% higher than A105 due to higher strength material and PVQ steel requirements.
Applications of ASTM A516 Grade 70 Flanges in Industry
The ASTM A516 Grade 70 High Strength Pressure Vessel Flanges are commonly used in many industrial applications, and some of the common industries are given below.
High-Pressure Vessels
ASME Section VIII Div 1 and 2, reactor vessel, separator and heat exchanger.
Petrochemical
Distillation columns, fractionators, absorbents, strippers, reactors, high-pressure process vessels.
Oil & Gas
Crude oil storage tank (API 650), production separator, knockout drum, scrubber, process vessel.
Refinery
Atmospheric and vacuum distillation, catalytic crackers, cokers, reformers, hydrotreaters.
Power Generation
Boiler drums, steam drums, headers, feed water heaters, deaerators, pressure vessels.
Chemical Processing
Reaction Vessels, mixing Tanks, pressure filters, crystallizers, evaporators.
Storage Tanks
API 650 large diameter storage tanks, API 620 low-pressure storage tanks, product storage.
LNG/LPG
LPG pressure storage (propane and butane) designed with appropriate temperature consideration.
Offshore Platforms
Pressure vessels, separators, scrubbers for offshore oil and gas production.
Nuclear Power
Non-nuclear pressure boundary components, secondary side pressure vessels.
Why Choose ASTM A516 Grade 70 Flanges from Metinox Overseas?
Metinox Overseas delivers premium ASTM A516 Grade 70 high-strength pressure vessel flanges with complete ASME Section VIII compliance, certified test reports, and guaranteed quality for critical applications. Our ISO 9001:2015 and PED 2014/68/EU certified facilities maintain extensive inventory of A516 Gr 70 flanges from 1/2" to 48" NB in all pressure classes, ensuring rapid delivery for urgent pressure vessel and storage tank projects worldwide.
Every flange ships with EN 10204 3.1B Mill Test Certificates including actual chemical composition, tensile test results (yield, tensile, elongation), heat treatment records, grain size verification, hardness values, and compliance statements for ASME Section VIII, API 650, and API 620 codes. We provide comprehensive supplementary testing per ASTM A20 including ultrasonic examination per A435 or A578 (S8, S12), Charpy impact testing, drop weight testing (S6), simulated post-weld heat treatment (S3), product analysis (S2), and vacuum carbon deoxidation (S1) when specified.
Our metallurgical team offers expert technical support for pressure vessel design per ASME Section VIII, material selection guidance, MDMT calculations, impact testing requirements, welding procedures, and PWHT recommendations. With third-party inspection support through TUV, SGS, DNV GL, Lloyd's Register, and Bureau Veritas, we ensure your A516 Gr 70 flanges meet the stringent requirements of pressure vessel codes and international standards. We serve pressure vessel fabricators, EPC contractors, tank manufacturers, and end-users in oil & gas, petrochemical, and power generation industries across 60+ countries.
ASTM A516 Grade 70 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 | 18-25 Days | CIF Lagos / CIF Durban |
| South America | Santos, Buenos Aires, Callao | 32-40 Days | CIF Santos / CIF Buenos Aires |
| Australia | Melbourne, Sydney, Brisbane | 25-32 Days | CIF Melbourne / CIF Sydney |
Other Types of High Strength A516 Gr 70 Flanges
ASTM A516 Grade 70 Pressure Vessel Flanges, High Strength A516 Gr 70 Weld Neck Flanges, SA516 Gr 70 Slip-On Flanges, ASME A516 Grade 70 Blind Flanges, A516 Gr 70 Spectacle Blind Flanges, A516 Grade 70 Socket Weld Flanges, A516 Gr 70 Threaded Flanges, ANSI B16.5 A516 Gr 70 Lap Joint Flanges, PVQ A516 Grade 70 Orifice Flanges, A516 Gr 70 Long Weld Neck Flanges, ASTM A516 Gr 70 Reducing Flanges, A516 Grade 70 Class 150 Flanges, A516 Gr 70 Class 300 Flanges, A516 Grade 70 Class 600 Flanges, A516 Gr 70 RTJ Flanges.
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Frequently Asked Questions (FAQ)
Grade 70 is stronger (tensile: 485-620 MPa vs 415-550 MPa; yield: 260 MPa vs 220 Mpa), but may contain a little more carbon. Grade 70 offers about 18 per cent greater strength, which enables it to use thinner wall pressure vessels with the same safety factors as ASME Section VIII.
A516 Gr 70 is controlled-chemistry and fine grain pressure vessel quality (PVQ) steel, and has the controlled toughness, especially when used in ASME Section VIII. Although the two are comparable in terms of pressure rating, Grade 70 has more strength (260 Mpa vs 250 Mpa yield) and superior notch toughness to use in critical pressure vessel service.
Rating A516 Gr 70 has a minimum rating of -29-C (-20-F) without impact testing (ASME Section VIII exemptions in UCS-66). Where the temperature is less, impact testing is necessary or upgrade to A350 LF2 (-46-C) or A350 LF3 (-101-C) to serve in cryogenic conditions. Please, always refer to MDMT calculations as per UCS-66.
Plates =38mm (1.5") may be furnished in the form of as-rolled. According to specification, plates over 38mm need to be normalized. Fabricated vessels may require stress relieving or PWHT as per the requirements of ASME Section VIII based on thickness, material and service conditions. See UCS- 56 regarding PWHT requirements.
ASME B16.5 A maximum continuous operating temperature of 427-C (800-F), same as A105. A516 is however optimized to moderate and low temperature service and is excellent in notch toughness. Above 427-C (954-F) change to alloy steel A182 F11/F22 or A182 F9.
Yes, having the right qualification. To comply with sour service per NACE MR0175/ISO 15156, state HIC (Hydrogen Induced Cracking) testing, limited hardness =22 HRC, product analysis and sour service documentation. Material should be in compliance with SSC (Sulfide Stress Cracking) resistance.
Low-hydrogen electrodes are to be used: SMAW E7018, GMAW ER70S-6, FCAW E71T-1 or GTAW ER70S-2. Preheat 95-150-C when thickness is above 25mm. Keep interpass temperature at less than 260-C. Heat treatment after welding, ASME Section VIII UCS-56. In accordance with qualified WPS according to ASME Section IX.
Yes, we offer ultrasonic examination to either ASTM A435 (straight beam) or A578 (angle beam) where so indicated as Supplementary Requirements S8 or S12 in ASTM A20. UT reports consist of scan records, acceptance criteria and operator certifications as per ASNT Level II/ III.
The European counterpart of A516 Gr 70 is P355GH (EN 10028-2) which has similar chemistry and mechanical characteristics (tensile 480-630 Mpa, yield 355 Mpa). They both are fine grain pressure vessel steels. A 516 Gr 70 is based on ASME/ASTM whereas P355GH is based on EN.
Stock items (1/2 NB-24" RF NB, 150/300/600 Class, normalized): 5-7 days ex works. Made-to-order with special testing (UT, impact, etc.): 5-6 weeks (including the acquisition of materials, forging, normalizing, testing, and documentation). Big diameter B16.47 or heavy wall: 6-8 weeks.
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