Nominal Seating Surface,Stem and Backseat Bushing or Weld-deposit Materials and Hardness

Trim Number

Nominal Trim

Seat Surface Hardness (HB) Minimum

Seat Surface Material Type

Seat Surface Typical Specifications Grade

Stem/Bushing

Stem Hardness(HB)

Basket

Cast

Forged

Welded

Material Type

Typical Specifications Type

Bushing Hardness (HB)

1

F6

Note c

13Cr

ASTM A 217 (CA 15)

ASTM A105(F6a)

AWS A5.9 ER 410

13 Cr

ASTM A276-T410 or T420

200 min 275 max

250 min

2

304

Note d

18Cr-8Ni

ASTM A351 (CF8)

ASTM A182(F304)

AWS A5.9 ER308

18Cr-8Ni

ASTM A276-T304

Note

Note

3

F310

Note d

25Cr-20Ni

NA

ASTM A182 (F310)

AWS A5.9 ER310

25Cr-20Ni

ASTM A276-T310

Note

Note

4

Hard F6

750 e

Hard 13Cr

NA

Note f

NA

13Cr

ASTM A276-T410 or T420

200 min 275 max

250 min

5

Hardfaced

350 e

Co-Cr A g

NA

NA

AWS A5.13 E or R CoCrA

13Cr

ASTM A276-T410 or T420

200 min 275 max

250 min

5A

Hardfaced

350 e

Ni-Cr

NA

NA

Note

13Cr

ASTM A276-T410 or T420

200 min 275 max

250 min

6

F6 and Cu-Ni

250 i

175 i

13Cr and

Cu-Ni

ASTM A 217(CA 15)

NA

ASTM A182(F6a)

Note k

AWS A5.9 ER410

NA

13Cr

NA

ASTM A276-T410 or T420

NA

200 min 275 max

NA

250 min

NA

7

F6 and Hard F6

250 i

750 i

13Cr and

Hard 13Cr

ASTM A 217(CA 15)

NA

ASTM A182(F6a)

Note f

AWS A5.9 ER410

NA

13Cr

NA

ASTM A276-T410 or T420

NA

200 min 275 max

NA

250 min

NA

8

F6 and Hardfaced

250 i

350 i

13Cr and

Co-Cr A g

ASTM A 217(CA 15)

NA

ASTM A182 (F6a)

NA

AWS A5.9ER410

AWS A5.13 E or R CoCrA

NA

ASTM A276-T410 or T420

NA

200 min 275 max

NA

250 min

NA

8A

F6 and Hardfaced

250 i

350 i

13Cr and

Ni-Cr

ASTM A 217(CA 15)

NA

ASTM A182 (F6a)

NA

AWS A5.9ER410

Note

13Cr

NA

ASTM A276-T410 or T420

NA

200 min 275 max

NA

250 min

NA

9

Monel

Note d

Ni-Cu Alloy

NA

MFG Standard

NA

Ni-Cu Alloy

MFG Standard

-
-
10

316

Note d

18 Cr-8Ni

ASTM A351 B(CF8M)

ASTM A183 (F316)

AWS A5.9 ER316

18Cr-8Ni-Mo

ASTM A276-T316

-
-
11

Monel and Hardfaced

Note d

350 i

Ni-Cu Alloy and

Trim 5 or 5A

NA

MFG Standard

NA

See Trim 5 or 5A

Ni-CuAlloy

NA

MFG Standard

NA

-
-
12

316 and Hardfaced

Note d

350 i

18 Cr-8 Ni-Mo

Trim 5 or 5A

ASTM A351 B(CF8M)

ASTM A182(F316)

AWS A5.9 ER316

See Trim 5 or 5A

18Cr-8Ni-Mo

NA

ASTM A276-T316

NA

-
-
13

Alloy 20

Note d

19Cr-29Ni

ASTM A351 (CN7M)

ASTM B473

AWS A5.9 ER320

19Cr-29Ni

ASTM B473

-
-
14

Alloy 20 and Hardfaced

Note d

350 i

19 Cr-29 Ni and

Trim 5 or 5A

ASTM A351 (CN7M)

NA

ASTM B473

NA

AWS A5.9 ER320

See Trim 5 or 5A

19Cr-29Ni

NA

ASTM B473

NA

-
-
15

Hardfaced

350 e

Co-Cr A g

NA

NA

AWS A5.13 E or R CoCrA

18Cr-8NI

ASTM A276-T304

-
-
16

Hardfaced

350 e

Co-Cr A g

NA

NA

AWS A5.13 E or R CoCrA

18Cr-10Ni-Mo

ASTM A276-T316

-
-
17

Hardfaced

350 e

Co-Cr A g

NA

NA

AWS A5.13 E or R CoCrA

18Cr-10Ni-Cb

ASTM A276-T347

-
-
18

Hardfaced

350 e

Co-Cr A g

NA

NA

AWS A5.13 E or R CoCrA

19Cr-29Ni

ASTM B473

-
-


NOTE Cr = Chromum; Ni = Nickel; Co = Cobalt; Cu = Copper; NA = Not Applicable.
a HB (formerly BHN) is the symbol for the Brinell hardness as per ASTM E10.
b Fee machining grades of 13Cr are prohibited.
c Body and gate seat surfaces should be 250 HB minimum with a 50 HB minimum differential between the body and gate seat surface.
d Manufacturer’s standard Hardness.
e Differential hardness between the body gate seat surface is not required
f Case hardness by nitriding to a thickness of 0.13 mm (0.005 In.) minimum.
g This classification includes such trademark materials as satellite 6™, Stoody 6™, and wallex 6™
h Manufacturer’s standard hardfacing with a maximum iron content of 25%
i Hardness differential between the body and gate seat surfaces shall be the manufacturer’s standard
j Not used
k Manufacturer’s standard with 30 Ni minimum
l Not used
m Typical backseat weld deposit material
n Per manufacture’s standard if not hardfaced 250 HB minimum if hardfaced
o This term is used as an example only, and does not constitute an endorsement of this product by API.


TRIM MATERIAL EQUIVALENT GRADES
TRIM

UNS

TYPE

GRADE (forged)

ASTM (wrought)

DIN

DIN W No.

F6
UNS S41000

 

13 Cr

ASTM A 182 F6a

A4276-410
DIN X12Cr13
1.4006
304

UNS S30400

18-8 Cr-Ni

ASTM A 182 F304

A276-304
DIN X5Cr-Ni 18 10
1.4301
316

UNS S31600

18-8 Cr-Ni (18-10-2)

ASTM A 182 F316

A276-316
DIN X5Cr-NiMo 18 10
1.4401
321

UNS S32100

18 Cr-10 Ni-Ti

ASTM A 182 F321

A276-321
DIN X6CrNiTi 18 10
1.4541
347

UNS S34700

18 Cr-10 Ni-Cb

ASTM A 182 F347

A276-347
DIN X6CrNiNb 18 10
1.455
MONEL®

UNS N04400

67Ni-30Cu

ASTM B564-N04400

B164-N04400
DIN 17743
2.436
ALLOY 20

UNS N08020

28Ni-19Cr-Cu-Mo

ASTM A182-F20*

ASTM B473
DIN 14500
2.466
ALLOY 625

UNS N06625

60Ni-22Cr-9Mo-3.5Cb

ASTM B564-N06625

ASTM B564-N06625
DIN 17361
2.4865
C276

UNS N10276

54Ni-15Cr-16Mo

ASTM B564-N10276
ASTM B574-N10276
DIN NiMo 16 Cr 15 W
2.4819
17/4PH

UNS S17400

0Cr17Ni4Cu4Nb

ASTM A4705 UNS S17400

ASTM A4705 UNS S17400
X5CrNiCuNb17-4-4
1.4548
St.Gr6

UNS R30006

Co Cr-A

AMS 5894

Stellite® Gr6