GOST 12821-80 PN6 Welding Neck Flanges SS304 SS316
Product Description
These welding neck flanges are fully produced in line with GOST 12821-80 standard, with a rated pressure of PN6, and are available in SS304 and SS316 stainless steel materials. The flanges adopt a precision forging process to ensure a dense internal structure, stable mechanical properties and high dimensional accuracy. The classic welding neck (WN) structure effectively reduces stress concentration at the joint, enhances pipeline stability, and provides better pressure resistance and sealing performance than ordinary plate or slip‑on flanges.
SS304 delivers good general corrosion resistance for daily medium and low‑pressure applications, while SS316 adds molybdenum to improve resistance to chloride corrosion, making it ideal for marine, chemical and humid environments. With strict CNC machining and surface treatment, these flanges feature smooth welding ends, uniform hole positions and strong interchangeability.
They are mainly used for fixed connection and transition between pipelines, valves and pressure equipment in industries such as petroleum, chemical, water supply, construction, heating and light industrial piping systems. With reliable performance, long service life and easy installation, they meet the requirements of long‑term stable operation under PN6 pressure conditions and comply with international delivery standards.
| Size: |
3 inch |
Material: |
ASTM A182 F321 |
Standard: |
ANSI B16.5 |
| Place of Origin: |
Shanghai, China (Mainland) |
Model Number: |
DN20-500 |
Brand Name: |
TOBO |
| Standard or Nonstandard: |
Standard |
material: |
ASTM A182 F321 |
Type: |
WN flange |
Packaging & Delivery
| Packaging Details: |
In wooden case, pallet or as customers' requirement |
| Delivery Detail: |
14-30 days |
Product Description
| flangeType |
Stainless Steel Flanges ASTM A 182, GR F1, F11, F22, F5, F9, F9 WN SO BL JIN ECT |
| Standard |
ASME/ANSI B16.5 |
| Size |
1/2’’~60’’ |
| Pressure Rate |
150lb to 2500lb |
| Manufacturing process |
Push, Press, Forge, Cast, etc. |
| Material |
stainless steel |
| Carbon steel |
ASTM A 105 |
|
Allloy steel flange
|
ASTM A182 F5; F11;F22;F91;F51
ASTM A350 LF1; LF2; A350 LF3 ;LF4;LF6;LF8
|
|
Stainless Steel flange
|
ASTM A182 F304/304H/304L
ASTM A182 F316/316H/316L
ASTM A182 F321/321H
ASTM A182 F347/347H
|
|
Nickel Alloys Flanges
|
Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276 |
|
Copper Alloys Flange
|
Copper, Brass & Gunmetal |
| Manufacture Standard |
ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B.S : BS4504 , BS4504, BS1560, BS10 |
| Package |
Wooden cases, pallets, nylon bags or according to the customers' requirements |
| MOQ |
1pcs |
| Delivery time |
10-100 days depending on quantity |
| Payment terms |
T/T or Western Union or LC |
| Shipment |
FCA Tianjin/Shanghai, CFR, CIF, etc |
| Application |
Petroleum/Power/Chemical/Construction/Gas/Metallurgy/Shipbuilding etc |
| Remarks |
Other materials and drawings are available. |
Product Range:
WNRF Flanges Size : 1/8" NB TO 48"NB.
WNRF Flanges Class : 150#, 300#,400 #,600#,900#, 1500# & 2500 #.
Stainless Steel WNRF Flanges: ASTM A 182, A 240
Grade : F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H,904L,
Duplex stainless steel UNS S31803, 2205, Super Duplex stainless steel UNS S32750
Carbon Steel WNRF Flanges: ASTM A 105, ASTM A 181
Alloy Steel WNRF Flanges : ASTM A 182, GR F1, F11, F22, F5, F9, F91
Nickel Alloys WNRF Flanges : Monel 400 & 500, Inconel 600 & 625, Incolloy 800, 825, Hastelloy C22,C276
Copper Alloys WNRF Flanges: Copper, Brass & Gunmetal
WNRF Flanges Standard
ANSI : ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN : DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629,
DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B.S : BS4504 , BS4504, BS1560, BS10
Value Added Services
Hot Dip Galvanizing , Epoxy Coating.
Test Certificate
Manufacturer Test Certificate as per EN 10204 / 3.1B
Why choose us
1. If the quantity of order is not very big,we could send them to you by express delivery,
such as TNT,DHL,UPS OR EMS etc.
2. If order is big ,we will advise you use Air Shipping or Sea Shipping through your nominated forwarder agent.
Our long-term cooperated agent also available.
FAQ
Q: Are you trading company or manufacturer ?
A: We are manufacturer ,You can see the certification.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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