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Forged Flanges


We are manufacture, supplier and exporter for a wide range of quality industrial forged steel pressure flanges including welding neck flange, slip-on flanges, socket weld flanges, blind flanges and other shapes for connection applications in the oil, gas, chemical, wind, pharmaceutical and other industries, manufactured in accordance with ASME , DIN, JIS, GB, ANSI, GOST, EN, BS and other engineering standards.

Forged Flanges Types


Pipe flange facing of america system, ring joint face except raised face, large or smalltongue face and groove face, large or smallmale face and female face, all can be manufactured according to standard.

Orifice flange equipped with orifice plate is used to measure the flow.Theere are two symmetrical, radial through holes in flange which is parallel to the sealed face.The distance to the sealed face is 0.94inch(23.9mm). They are equipped with two plugs of size NPT 1/2 mating the threaded hole in the outer end. The diameter of through holes as following.

Forged Flanges Type:

SW;WN;SO;BL;LJ;TH ; FF,RTJ

Forged Flanges Forming: 

Forged

Forged Flanges Size:

1/2”—120”

Forged Flanges Standard:

GB9112~9124, GB13402, SH3406, HG20615~20623, HG20592~20605, JB74~90, ISO7005-I, ASME/ASNI B16.5/16.36/16.47A/16.47B, MSS SP44, JIS B2220-2001, DIN 2527/2636/2637/2638/2566/2576/2632/2633/2635/2642/2653/2655/2656, DIN2628/DIN2629, DIN2634 , BS 1560-3.1, BS4504-3.1, API 7S-15, API 7S-43, API 605, NFE 29-203 GOST12821 GOST 12820 

Forged Flanges Rating:

ANSI 150LBS~2500LBS
DIN PN6~PN400 
JIS 5K~30K
HG PN0.25~PN25
PN2.0~PN42.0

Forged Flanges Material:

Stainless Steel :
OCr18Ni9, 0Cr18Ni9Ti, 1Cr18Ni9Ti, 0Cr18Ni12Mo2Ti, 00Cr19Ni10, 00Cr17Ni14Mo2, ASTM A182-F304, F304L, F304H, F316, F316L, F321, F321H, F347H, F317,
Super Stainless Steel: 
ASTM A182-904L, 317, 317L
Duplex Steel:
ASTM A182-F51, F53, F44
Special Steel :
N06600, N08800, N08811 
Alloy Steel:
16Mn, 12CrMo, 15Cr5Mo, Cr5Mo, 12Cr1MoV, ASTM A182-F11, F22, F91 F9 F5
Pipe Line:
ASTM A694-F42, F46, F48, F50, F52, F56, F60, F65, F70, F80
Carbon Steel :
ASTM A350-LF2, LF3 Q235A, 20#, ASTM A105

Tolerance of flange (ASME /ANSI standard)

Thread ,Socket-welding,Slip-on, Lap joint and Blind flange Tolerence

Welding neck raised face flange tolerence

Outside Diameter

≦ 24" 

±1.6mm

Outside Diameter

≦ 24" 

±1.6mm

>24"

±3.2mm

>24"

±3.2mm

Inside Diameter

Threaded

Within limits on boring gauge

Inside Diameter

≦10”

±0.8mm

Socket-welding

ID≦10"  +0.8mm

ID≧12"   +1.6mm  

<20”

±1.6mm

Slip on

≧20”

-1.6mm     +3.2mm

Lap joint

Diameter of hu at base

≦24”

±1.6mm

Outside Diameter of Hub

≦ 5"

+2.4mm

-0.8mm

>24”

±3.2mm

≧ 6"

+ 4.0mm

-0.8mm

Diameter of hub at point of welding

≦ 5"

-0.8mm    +2.4mm

Diameter of contact face

1/16” raised face

±0.8mm

≧ 6"

-0.8mm    +4.0mm

1/4” raised face tongue&groove male,female

±0.4mm

Diameter of contact face

1/16” raised face

±0.8mm

Diameter of counterbore

Same as for inside diameter

1/4” raised face tongue&groove male,female

±0.4mm

Drilling

Bolt circle

±1.6mm

Drilling

Bolt circle

±1.6mm

Bolt hole spacing

±0.8mm

Bolt hole spacing

±0.8mm

Eccentricity of bolt circle with respect to facing

<2-1/2”

Max  0.8mm

≧3”

Max  1.6mm

Eccentricity of bolt circle with respect to facing

<2-1/2”

Max  0.8mm

≧3”

Max  1.6mm

Eccentricity of bolt circle with respect to bore

Max 0.8mm

Eccentricity of bolt circle with respect to bore

Max 0.8mm

Eccentricity of facing with respect to bore

Max 0.8mm

Eccentricity of facing with respect to bore

Max 0.8mm

Thickness

≦18”

0- +3.2mm

Thickness

≦18”

1- +3.2mm

≧20”

0- +4.8mm

≧20”

1- +4.8mm

Length thru hub

≦10”

±1.6mm

Length thru hub

≦10”

±1.6mm

≧12”

±1.6mm

≧12”

±1.6mm

WENZHOU HUASHANG STEEL CO., LTD.