BoYue Steel China Co.,Ltd
BoYue&Tianda Oil Pipe Co., Ltd
BoYue Industry (ShangHai) Co., Ltd
BoYue & BaoSteel Pipeline Equipment Co.,Ltd
Payment & Shipping Terms:
|SIZE:||1/2" - 24"||PROCESS:||FORGED|
|CLASS RATING:||Class150/300/600/900/1500 Etc||SEALING FACE:||RTJ/FF/RF|
|FACE FINISH:||SMOOTH /STOCK FINISH||PRODUCT NAME:||Weld Neck Pipe Flanges|
stainless steel weld neck flange,
reducing weld neck flange
Forged DN125A - 250A Weld Neck Pipe Flanges Galvanizing For Oil Pipe Connection Size2'-24'
Carbon Steel :A105,CT20,CT25,P245GH Low Temperature
Carbon Steel: ASTM SA350 LF2
High Strength Steel: ASTM SA694 F42/46/52/56/60/65/70
Carbon steel is broken down into four classes based on carbon content:
0.05 to 0.30% carbon (plain carbon steel) content.
Approximately 0.3–0.6% carbon content.Balances ductility and strength and has good wear
resistance; used for large parts, forging and automotive components.
Approximately 0.60 to 1.00% carbon content.Very strong, used for springs, edged tools, and high-
2.ASTM B 16.5
The B16.5 Standard defines the following:
(5) Pressure/Temperature Ratings
(6) Pressure Testing
|Blind||Lap Joint||Slip On||Socket Weld||Threaded||Weld Neck|
|Flange Dimensions||Flange Dimensions||Flange Dimensions||Flange Dimensions||Flange Dimensions||Flange Dimensions|
|Class 150||Class 150||Class 150||Class 150||Class 150||Class 150|
|Class 300||Class 300||Class 300||Class 300||Class 300||Class 300|
|Class 400||Class 400||Class 400||Class 600||Class 400||Class 400|
|Class 600||Class 600||Class 600||Class 1500||Class 600||Class 600|
|Class 900||Class 900||Class 900||Class 900||Class 900|
|Class 1500||Class 1500||Class 1500||Class 1500||Class 1500|
|Class 2500||Class 2500||Class 2500||Class 2500||Class 2500|
|Type||Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint,Spectacle Blind,Etc|
|Standard||ANSI, ASME ,MSS, API, DIN, JIS, BS. AWWA,GOST,EN and GB|
|BS PN0.25-PN25 PN2.0-PN42.0|
|Materials||Carbon Steel :A105,CT20,CT25,P245GH|
|Low Temperature Carbon Steel: ASTM SA350 LF2|
|High Strength Steel: ASTM SA694 F42/46/52/56/60/65/70|
|Stainless Steel||ASTM A182 F304/304L/316/316L|
|Alloy Steel||ASTM A182 F1/F5/F9/F11/F22/F91/Etc.|
|Duplex stainless steel||ASTM A182 F51/F53/F55/F60|
|Nicke alloys||Nickel 200, Monel 400, Inconel 600/625, Incoloy 825/800|
|Process||Free forging, plate cutting.|
|Printing||Carbon steel and alloy steel with yellow print, black print, oil or zinc.|
|Delivery||Usually within one month after receiving the formal order .|
|Inspection||Factory in-house or Third Party inspection available upon requests.|
5.ASME standards (U.S.)
Pipe flanges that are made to standards called out by ASME B16.5 or ASME B16.47, and MSS SP-44.
They are typically made from forged materials and have machined surfaces. ASME B16.5 refers to
nominal pipe sizes (NPS) from ½" to 24". B16.47 covers NPSs from 26" to 60". Each specification
further delineates flanges into pressure classes: 150, 300, 400, 600, 900, 1500 and 2500 for B16.5,
and B16.47 delineates its flanges into pressure classes 75, 150, 300, 400, 600, 900. However these
classes do not correspond to maximum pressures in psi. Instead, the maximum pressure depends on
the material of the flange and the temperature. For example, the maximum pressure for a Class 150
flange is 285 psi, and for a Class 300 Flange it is 740 psi (both are for ASTM A105 Carbon Steel and
temperatures below 100F).
The gasket type and bolt type are generally specified by the standard(s); however, sometimes the
standards refer to the ASME Boiler and Pressure Vessel Code (B&PVC) for details (see ASME Code
Section VIII Division 1 – Appendix 2). These flanges are recognized by ASME Pipe Codes such as
ASME B31.1 Power Piping, and ASME B31.3 Process Piping.
Materials for flanges are usually under ASME designation: SA-105 (Specification for Carbon Steel
Forgings for Piping Applications), SA-266 (Specification for Carbon Steel Forgings for Pressure Vessel
Components), or SA-182 (Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings,
and Valves and Parts for High-Temperature Service). In addition, there are many "industry standard"
flanges that in some circumstance may be used on ASME work.
The product range includes SORF, SOFF, BLRF, BLFF, WNRF (XS, XXS, STD & Schedule 20, 40, 80),
WNFF (XS, XXS, STD & Schedule 20, 40, 80), SWRF (XS & STD), SWFF (XS & STD), Threaded RF,
Threaded FF & LJ, with sizes from 1/2" to 16". The bolting material used for flange connection is stud
bolts mated with two nut (washer when required). In Petrochemical industries, ASTM A193 B7 STUD
& ASTM A193 B16 Stud Bolts are used as these have high tensile strength.
Galvanizing protects the underlying iron or steel in the following main ways:
The zinc coating, when intact, prevents corrosive substances from reaching the underlying steel or iron.
The zinc protects iron by corroding first. For better results, application of chromates over zinc is also
seen as an industrial trend.
In the event the underlying metal becomes exposed, protection can continue as long as there is zinc
close enough to be electrically coupled. After all of the zinc in the immediate area is consumed,
localized corrosion of the base metal can occur.
Why Choose Us
1.One-Stop Service,One Single Source.
3.Best quality,competitive price
6.Professional sales and technical team .
Q1: Are you a factory or a trade company?
A1: We are a professional manufacturer for designing and producing of Large-size products.(View Mor)
Q2: Do you make customized products or finished parts?
A2: All parts are custom made only, and in stock, we can produce based on your drawings.
Q3: Will my drawing be safe after you get it?
A3: Yes, we will not release your design to third party unless with your permission.
Q4: What is the MOQ?
A4: Small order is acceptable, but the more, the cheaper.
Q5: How about the samples?
A5: We are happy to make prototype part or sample for clients to ensure quality standard, but it’s charged according to your drawing.