Alloy Steel A182 F12/F22/F91 Flange

Grade

Heat Treat Type

Austenitizing/Solutioning Temperature, Minimum or Range, ℉［℃］^A

Cooling Media

Quenching Cool Below ℉［℃］

Tempering Temperature, Minimum or Range, ℉［℃］

F12, Class1,2

anneal

1650［900］

Furnace cool

B

1150［620］

Normalize and temper

1650［900］

Air cool

B

1150［620］

F22, Class1,3

anneal

1650［900］

Furnace cool

B

1250［675］

Normalize and temper

1650［900］

Air cool

B

1250［675］

F91, Type1&2

 Normalize and temper or quench and temper

1900-1975［1040-1080］

Air cool accelerated air cool or liquid

B

1350-1470［730-800］

B

Grade

UNS Designation

C

Mn

P

S

Si

Ni

Cr

Mo

Co

Ti

Other Elements

F12 Class 1

K11562

0.05-0.15

0.30-0.60

0.045

0.045

0.50 MAX

...

0.80-1.25

0.44-0.65

...

...

...

F12 Class 2

K11564

0.10-0.20

0.30-0.60

0.040

0.040

0.10-0.60

...

0.80-1.25

0.44-0.65

...

...

...

F22 Class 1

K21590

0.05-0.15

0.30-0.60

0.045

0.040

0.50

...

2.00-2.50

0.87-1.13

...

...

...

F22 Class 3

K21590

0.05-0.15

0.30-0.60

0.040

0.040

0.50

...

2.00-2.50

0.87-1.13

...

...

...

F91 Type1

K90901

0.08-0.12

0.30-0.60

0.020

0.010

0.20-0.50

0.40

8.0-9.5

0.85-1.05

0.06-0.10

...

N 0.03-0.07

Al 0.02(applies to both heat and product analyses

V 0.18-0.25

Ti 0.01

Zr 0.01

F91 Type2

Heat Product

K90901

0.08-0.12

0.07-0.13

0.30-0.50

0.020

0.005

0.20-0.40

0.20

8.0-9.5

0.85-1.05

0.85-1.05

0.06-0.10

0.05-0.11

0.01

N 0.035-0.07

Al 0.020(applies to both heat and product analyses

V Heat 0.18-0.25

V Prod 0.16-0.27

Ti 0.01

Zr 0.01

B 0.001

Cu 0.10

W 0.05

Sn 0.010

As 0.010

Sb 0.003

Grade Symbol

Tensile Strength, min, ksi［Mpa］

Yield Strength, min, ksi［Mpa］

Elongation in 2 in.［50mm］or 4D, min, %

Reduction of Area, min, %

Brinell Hardness Number, HBW, unless otherwise indicated

F12 Class 1

60［415］

32［220］

20

45

121-174

F12 Class 2

70［485］

40［275］

20

30

143-207

F22 Class 1

60［415］

30［205］

20

35

170 max

F22 Class 3

75［515］

45［310］

20

30

156-207

F91 Type1 and 2

90［620］

60［415］

20

40

190-248