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  • A105 Pipe Flanges

Name:A105 Pipe Flanges
Specificaiton:ASTM A105
Size::1/2" to 120"
Rating:150Lb to 2500Lb
Steel Grade:A105
Seal Face:RF, RTJ, FF
Delivery term:FOB, CNF, CIF and EXW
Payment Term:TT or LC At sight
Loading Port:XINGANG
Deliver mode:By Sea, By Air and By Land
Packing:Standard seaworthy/airworthy packing
Standard:ANSI, JIS, BS, EN, DIN

Product Description

ASTM A105 Forged CARBON STEEL Pipe flanges

Hebei Zhongji Is A Global Leading Manufacturer For Your ASTM A105 Forged Carbon Steel Pipe Flanges Needs. 


A105 pipe flanges are seamless forged carbon steel piping components for use in pressure systems at ambient and high-temperature service.

Steel flanges, fittings, valves and various other parts ordered to customer dimension or to industry standards such as MSS, ASME and API specification are included in the scope.

Forgings to this specification are limited to 10,000 lbs.

ASTM A105 Forged Carbon Steel Pipe Flanges Types

  • Raised Face Socket Welding Flanges / SWRF Flanges
  • Raise Face Slip On Flanges / SORF Flanges 
  • Raised Face Threaded Flanges / Screwed Flanges
  • Raised Face Blind Flanges / BLRF Flanges 
  • Raised Face Weld Neck Flanges / WNRF Flanges
  • Reducing Flanges
  • Orifice Flanges
  • Raised Face Plate Flanges / PLRF Flanges
  • Buttweld Flanges

ASTM A105 Forged Carbon Steel Pipe Flanges Pressure Rating

150#, 300#, 400#, 600#, 900#, 1500#, 2500# 

ASTM A105 Forged Carbon Steel Pipe Flanges Dimensions 

ASTM A105 Forged Carbon Steel Pipe Flanges Weight


These components can be welded. Welding procedures must comply with ASME Boiler and Pressure Vessel Code Section IX.

ASTM A105 Forged Carbon Steel Pipe Flanges Heat Treatment

Heat treatment is not a mandatory requirement except for flanges above Class 300, flanges of special design where the design pressure or design temperature are not known and for items over 4” NPS and above Class 300. When heat treatment is required, annealing, normalizing, normalize and temper, normalize and quench and tempering shall be the applied methods.


This alloy is forged at between 1,700 degrees Fahrenheit and 2,200 degrees Fahrenheit, followed by quenching and tempering.


Forged parts are allowed to cool to below 1,000 degrees Fahrenheit before reheating to between 1,550 degrees Fahrenheit and 1,700 degrees Fahrenheit. Slow furnace cooling follows.

ASTM A105 Forged Carbon Steel Pipe Flanges Chemical Composition

Element Composition %, Note C
Carbon .35 max
Manganese .60-1.05
Phosphorus .035 max
Sulfur .040 max
Silicon .10-35
Copper .40 max, note A
Nickel .40 max, note A
Chromium .30 max, note A,B
Molybdenum .12 max, note A,B
Vanadium .08 max, note A
Note A – The sum of copper, nickel, chromium, molybdenum and vanadium shall not exceed 1.00%
Note B – The sum of chromium and molybdenum shall not exceed .32%
Note C – for each reduction of 0.01% below the specified carbon maximum (.35%), an increase of .06% manganese above the specified maximum (1.05%) will be permitted up to a maximum of 1.65%

ASTM A105 Forged Carbon Steel Pipe Flanges Mechanical Properties

Tensile 70 ksi, min
Yield, note A 36 ksi, min
Elongation in 2in, Basic minimum for wall 5/16″ and over, strip test 30%
Hardness 187 HBW max
Note A – Determined by either the 0.2% offset method or the 0.5% extension-under-load method. Other test methods available as listed in A105.

Hydrostatic Test

Hydrostatic Test shall be conducted by the forging manufacture only when Supplemental S57 of ASTM A961 is specified.

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ASTM A105 Specification

ASTM A105 Specificat...

ASTM A105 Specification stipulate the chemical composition, Mechanical Properties and pressure ratings of A105 flanges and fittings.