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ASTM A335


Grade

UN
Sequiv.

C≤

Mn

P≤

S≤

Si≤

Cr

Mo

P1

K11522

0.10~0.20

0.30~0.80

0.025

0.025

0.10~0.50

–

0.44~0.65

P2

K11547

0.10~0.20

0.30~0.61

0.025

0.025

0.10~0.30

0.50~0.81

0.44~0.65

P5

K41545

0.15

0.30~0.60

0.025

0.025

0.5

4.00~6.00

0.44~0.65

P5b

K51545

0.15

0.30~0.60

0.025

0.025

1.00~2.00

4.00~6.00

0.44~0.65

P5c

K41245

0.12

0.30~0.60

0.025

0.025

0.5

4.00~6.00

0.44~0.65

P9

S50400

0.15

0.30~0.60

0.025

0.025

0.50~1.00

8.00~10.00

0.44~0.65

P11

K11597

0.05~0.15

0.30~0.61

0.025

0.025

0.50~1.00

1.00~1.50

0.44~0.65

P12

K11562

0.05~0.15

0.30~0.60

0.025

0.025

0.5

0.80~1.25

0.44~0.65

P15

K11578

0.05~0.15

0.30~0.60

0.025

0.025

1.15~1.65

–

0.44~0.65

P21

K31545

0.05~0.15

0.30~0.60

0.025

0.025

0.5

2.65~3.35

0.80~1.60

P22

K21590

0.05~0.15

0.30~0.60

0.025

0.025

0.5

1.90~2.60

0.87~1.13

P91

K91560

0.08~0.12

0.30~0.60

0.02

0.01

0.20~0.50

8.00~9.50

0.85~1.05

P92

K92460

0.07~0.13

0.30~0.60

0.02

0.01

0.5

8.50~9.50

0.30~0.60


Werkstoff /DIN

EN

ASTM

1.5415

16Mo3

A335 Grade P1

1.7335

13CrMo4-5

A335 Grade P11, P12

1.7380

10CrMo9-10

A335 Grade P22

1.7362

X11CrMo5

A335 Grade P5



A335 Grade P9

1.4903

X10CrMoVNb9-1

A335 Grade P91


Tensile Requirements

Tensile Strength, min., psi

P-5

P-9

P-11

P-22

P-91

ksi

60

60

60

60

85

MPa

415

415

415

415

585

Yield Strength, min., psi






ksi

30

30

30

30

60

MPa

205

205

205

205

415


Mechanical properties

P1,P2

P12

P23

P91

P92,P11

P122

Tensile strength

380

415

510

585

620

620

Yield strength

205

220

400

415

440

400


Heat Treatment Requirements

Grade

Heat Treatment Type
P5, P9, P11, and P22

Normalizing Temperature Range F [C]

Subcritical Annealing or Tempering
Temperature Range F [C]

A335 P5 (b,c)

Full or Isothermal Anneal




Normalize and Temper

*****

1250 [675]


Subcritical Anneal (P5c only)

*****

1325 – 1375 [715 - 745]

A335 P9

Full or Isothermal Anneal




Normalize and Temper

*****

1250 [675]

A335 P11

Full or Isothermal Anneal




Normalize and Temper

*****

1200 [650]

A335 P22

Full or Isothermal Anneal




Normalize and Temper

*****

1250 [675]

A335 P91

Normalize and Temper

1900-1975 [1040 - 1080]

1350-1470 [730 - 800]


Quench and Temper

1900-1975 [1040 - 1080]

1350-1470 [730 - 800]


Permissible Variation in Wall Thickness

NPS [DN] Designator

Tolerance, % from Specified


Over

Under

1/8 to 2 1/2 [6 to 65] incl., all t/D ratios

20.0%

12.5%

Above 2 1/2 [65], t/D < or = 5%

22.5%

12.5%

Above 2 1/2 [65], t/D > 5%

15.0%

12.5%

(t = Specified Wall Thickness; D = Specified Outside Diameter)


Elongation Requirements

Elongation in 2 in. or 50 mm, min %

Wall Thickness

P5, P9, P11, P22


P91

in.

mm

Longitudinal

Transverse


Longitudinal

5/16 (0.312)

8

30

20


20

9/32 (0.281)

7.2

28

19


19

1/4 (0.250)

6.4

27

18


18

7/32 (0.219)

5.6

26



17

3/16 (0.188)

4.8

24



16

5/32 (0.156)

4

22



15

7/8 (0.125)

3.2

21



14

3/32 (0.094)

2.4

20



13

1/18 (0.062)

1.6

18



12


Permissible Variations in Outside Diameter

NPS [DN] Designator

Over

Under


in.

mm

in.

mm

1/8 to 1 1/2 [6 to 40], incl.

1/64 (0.015)

0.40

1/64 (0.015)

0.40

Over 1 1/2 to 4 [40 to 100], incl.

1/32 (0.031)

0.79

1/32 (0.031)

0.79

Over 4 to 8 [100 to 200], incl.

1/16 (0.062)

1.59

1/32 (0.031)

0.79

Over 8 to 12 [200 to 300], incl.

3/32 (0.093)

2.38

1/32 (0.031)

0.79

Over 12 [300]

+/- 1% of the specified outside diameter


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