Flange Materials Specification

Dimensions from carbon steel and stainless steel flanges are defined in the ASME B16.5 standard. The material qualities for these flanges are defined in the ASTM standards.

These ASTM standards, define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".
For example, a carbon steel flange can be identified with Grade F9 or F11, a stainless-steel flange with Grade F316 or Grade F321 etc..
Below you will find as an example a table with chemical requirements for fittings ASTM A403 Grade WP304, WP304L, WP316L and a table with frequent Grades, arranged on pipe and pipe-components, which belong together as a group. As you may be have noted, in the table below, ASTM A105 has no Grade. Sometimes ASTM A105N is described;
"N" stands not for Grade, but for normalized. Normalizing is a type of heat treatment, applicable to ferrous metals only. The purpose of normalizing is to remove the internal stresses induced by heat treating, casting, forming etc.

Carbon Steel Flanges

The Carbon Steel Flanges are available in various dimensions. Exhibiting the properties such as high strength, high toughness, excellent fatigue strength, superior chemical resistance and high stress-corrosion cracking resistance, these flanges are ideal for connecting various pipes and are significant while support is required for mechanical parts.

• ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2
• ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70

Stainless Steel Flange

Stainless Steel flanges are corrosion resistant and have a wide variety of uses. We carry variety of threaded flanges, weld neck flanges and slip on flanges and of course we can can custom build stainless steel flanges to your specifications.

• ASTM A182 F304/304L, F316/316L, F316H, F310, F321, F44 (UNS S31254)
• ASTM A403 WP316/316L
• ASTM A403 WP304/304L
• ASTM A182 F304, F304L, F316, F316L, F321

Alloy steel flanges

Alloy steel flange, that is, the main material is alloy steel flange or end flange connectors. It contains alloy steel flange, known as alloy steel flange.

We shall be pleased to develop Non-Standard

• ASTM A182 F1, F5a, F9, F11, F12, F22, F91

  316 / 316L

  316/316Lis the most commonly used austenitic stainless steel in the chemical process industry. The addition of molybdenum increases general corrosion resistance, improves chloride pitting resistance and strengthens the alloy in high temperature service. Through the controlled addition of nitrogen it is common for 316/316L to meet the mechanical properties of 316 straight grade, while maintaining a low carbon content.

  Chemistry

  	Ni	Cr	Mo	Mn	Si	C	S	P	N	Fe
  MIN	10.0	16.0	2.0	-	-	-	-	-	-	-
  MAX	14.0	18.0	3.0	2.0	0.75	0.03	0.03	0.045	0.1	Balance

  
  

  Physical Properties

  Density:0.285 lb/inch3
  Poisson's Ratio:0.3
  Electrical Resistivity:445 Ohm-circ mil/ft

  Temperature, °F	70	212	932	1832
  Coefficient* of Thermal Expansion, in/in°F x 10-6	-	9.2	10.1	10.8
  Thermal Conductivity Btu • ft/ft2 • hr • °F	7.8	-	-	-
  Modulus of Elasticity Dynamic, psi x 106	29	-	-	-

  
  

  Mechanical Properties

  Representative Tensile Properties

  Ultimate Tensile Strength, ksi	75
  0.2% Yield Strength, ksi	30
  Elongation, %	40
  Hardness MAX, Brinell	217

  Typical Tensile and Impact Properties

  Temperature, °F	70	200	400	600	800	1000	1200	1400
  Ultimate Tensile Strength, ksi	82.4	75.6	71.1	71.1	71.1	68.4	50.7	30.7
  0.2 % Yield Strength, ksi	42.4	-	-	-	26.5	23.4	22.6	-
  Charpy Impact V-notch, ft-lbs	65 - 100	-	-	-	-	-	-	-

  304 / 304L

  304 is the original "18-8" stainless. It is produced in greater quantity than any other austenitic stainless steel. 304 provides useful resistance to corrosion in many environments ranging from moderately reducing to moderately oxidizing. Through the controlled addition of nitrogen, it is common for 304L to meet the mechanical properties of 304 straight grade. As a result, most products are dual certified as 304 and 304/304L.

  Chemistry

  	Ni	Cr	Mn	Si	C	S	P	N	Fe
  MIN	8.0	18.0	-	-	-	-	-	-	-
  MAX	10.5	20.0	2.0	0.75	0.03	0.03	0.045	0.10	Balance

  
  

  Inventory

  304 / 304L Coil, 304 / 304L Fittings, 304 / 304L Flanges, 304 / 304L Hex Bar, 304 / 304L Pipe, 304 / 304L Plate, 304 / 304L Sheet, 304 / 304L Stub Ends, 304 / 304L Tees, 304 / 304L Tubing, 304 / 304L Weld Wire

  Common Trade Names

  304 Stainless, 304L Stainless

  Features

  • Good general corrosion resistance
  • Ease of cleaning
  • Excellent strength and toughness at cryogenic temperatures
  • Good formability
  • Good weldability

  
  

  Applications

  • Food processing and handling
  • Heat exchangers
  • Chemical process vessels
  • Conveyors
  • Architectural

  
  
  

  Physical Properties

  Density:0.285 lb/inch3
  Melting Range:2550-2590°F
  Poisson's Ration:0.3
  Electrical Resistivity:433Ohm-circ mil/ft

  Temperature, °F	70	212	932
  Coefficient* of Thermal Expansion, in/in°F x 10-6	-	9.2	-
  Thermal Conductivity Btu • ft/ft2 • hr • °F	-	9.4	12.4
  Modulus of Elasticity Dynamic, psi x 106	29	-	-

  * 70°F to indicated temperature.

  
  

  Mechanical Properties

  Representative Tensile Properties

  Ultimate Tensile Strength, ksi	75
  0.2% Yield Strength, ksi	30
  Elongation, %	40
  Hardness MAX, Brinell	201

  
  Typical Tensile and Impact Properties

  Temperature, °F	-425	-320	-100	70	400	800	1200
  Ultimate Tensile Strength, ksi	250	230	150	90	70	66	48
  0.2 % Yield Strength, ksi	100	70	50	35	23	19	15.5
  Charpy Impact V-notch, ft-lbs	85	85	-	150	-	-	-

  Alloy Steel Flange

  Our manufacturing arena is well known in the market that comprises of various flanges one of which is Alloy Steel flanges. They are available in variety such as weld neck, Deck flange, lap joint etc. They are made of steel and other metals thereby forming an alloy. These flanges have undergone stringent quality check and have been certified by national authorities.

  • ASTM A182 F1, F5a, F9, F11, F12, F22, F91

  Chemical Requirements (Composition, %, max)

  Material Symbol	C	Mn	P	S	Si	Ni	Cr	Mo	Cu	N	V	Co
  ASTM A105	0.35	0.60-1.05	0.035	0.040	0.10-0.35	0.40	0.30	0.12	0.40	_	0.08	_
  ASTM A350 LF2	0.30	0.60-1.35	0.035	0.040	0.15-0.30	0.40	0.30	0.12	0.40	_	0.08	0.02
  ASTM A182 F304	0.08	2.00	0.045	0.030	1.00	8.0-11.0	18.0-20.0	_	_	_	_	_
  ASTM A182 F304L	0.03	2.00	0.045	0.030	1.00	8.0-13.0	18.0-20.0	_	_	_	_	_
  ASTM A182 F316	0.08	2.00	0.045	0.030	1.00	10.0-14.0	16.0-18.0	2.00-3.00	_	_	_	_
  ASTM A182 F316L	0.03	2.00	0.045	0.030	1.00	10.0-15.0	16.0-18.0	2.00-3.00	_	_	_	_
  ASTM A182 F321	0.08	2.00	0.045	0.030	1.00	9.0-12.0	17.0-19.0	_	_	_	_	_
  EN 10025 S235JR	0.20	1.40	0.045	0.045	_	_	_	_	_	0.009	_	_
  20Mn	0.17-0.23	0.70-1.00	0.035	0.035	0.17-0.37	0.30	0.25		0.25
  20	0.17-0.23	0.60-1.00	0.030	0.020	0.17-0.37	0.25	0.25		0.25
  16Mn	0.13-0.19	1.20-1.60	0.030	0.020	0.20-0.60	0.30	0.30		0.25

  Mechanical Requirements

  Material Symbol	Tensile Strength, min, MPa	Yield point, min, Mpa	Elongation, min, %	Reduction of area, min, %	Hardness, max, HB	Min. Impact Average, J	Test Temperature, °C
  ASTM A105	485	250	22	30	187
  ASTM A350 LF2	485-655	250	22	30		20	-46
  ASTM A182 F304	515	205	30	50
  ASTM A182 F304L	485	170	30	50
  ASTM A182 F316	515	205	30	50
  ASTM A182 F316L	485	170	30	50
  ASTM A182 F321	515	205	30	50
  20Mn	450	275	24	50	197
  20	410	245	25	55	156