API 600 Trim Number Chart
API 600 Trim Number Chart covers all trim No. including trim No. 1, 2, 3, 4, 5, 5A, 5B, 6, 7, 8, 8A, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 19A, 19B, 19C, 20, 20A and 20B.
API 600 Trim Number specifies the seat surface, stem and backseat bushing material and their hardness requirement. API 600 Trim Number are applicable to cast steel gate valves, as well as cast steel globe valves and cast steel check valves.
API 600 Trim Number Chart (Seat Surface, Stem and Backseat Bushing)
| Trim | Nominal Trim | Seating Surface Hardness (HB) Minimum a | Seating Surface Material Type b | Seating Surface Typical Specifications Grade | Stem/Backseat Bushing p | Stem Hardness (HB) | Backseat Bushing Hardness (HB) | |||
| Cast (Integral) | Forged (Integral) | Welded m | Material Type b | Typical Specifications Type | ||||||
| 1 | F6 | TRIM NUMBER 1 IS OBSOLETE | ||||||||
| 2 | 304 | Note d | 18Cr-8Ni | ASTM A351 (CF8) | ASTM A182 (F304) | AWS A5.9 ER308 | 18Cr-8Ni | ASTM A276-T304 | Note d | Note d |
| 3 | F310 | Note d | 25Cr-20Ni | NA | ASTM A182 (F310) | AWS A5.9 ER310 | 25Cr-20Ni | ASTM A276-T310 | Note d | Note d |
| 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-CrA9 | NA | NA | AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min. |
| 5A | Hardfaced | 350 e | Ni-Cr | NA | NA | Note h | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min. |
| 5B | Hardfaced | 350 e | UNS R31233 | NA | NA | UNS R31233- | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min. |
| 6 | F6 and Cu-Ni | 250 j | 13Cr | ASTM A 217 (CA 15) | ASTM A182 (F6a) | AWS A5.9 ER410 | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min |
| 175 j | Cu-Ni | NA | Note k | NA | ||||||
| 7 | F6 and Hard F6 | 250 j | 13Cr | ASTM A 217 (CA15) | ASTM A182 (F6a) | AWS A5.9 ER410 | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min. |
| 750 j | Hard 13Cr | NA | Note f | NA | ||||||
| 8 | F6 and Hardfaced | 250 j | 13Cr | ASTM A 217 (CA15) | ASTM A182 (F6a) | AWS A5.9 ER410 | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min |
| 350 j | Co-CrA 9 | NA | NA | AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A | ||||||
| 8A | F6 and Hardfaced | 250 j | 13Cr | ASTM A 217 (CA15) | ASTM A182 (F6a) | AWS A5.9 ER410 | 13Cr | ASTM A276 T410 or T420 | 200 min 275 max |
250 min. |
| 350 j | Ni-Cr | NA | NA | Note h | ||||||
| 9 | Monel TM* | Note d | Ni-Cu Alloy | NA | MFG Standard | NA | Ni-Cu Alloy | MFG Standard | Note d | Note d |
API 600 Trim Number Chart (Seat Surface, Stem and Backseat Bushing)
-Continued
| Trim | Nominal Trim | Seating Surface Hardness (HB) Minimum a | Seating Surface Material Type b | Seating Surface Typical Specifications Grade | Stem/Backseat Bushing p | Stem Hardness (HB) | Backseat Bushing Hardness (HB) | |||
| Cast (Integral) | Forged (Integral) | Welded m | Material Type b | Typical Specifications Type |
||||||
| 10 | 316 | Note d | 18Cr-8Ni | ASTM A351 (CF8M) | ASTM A182 (F316) | AWS A5.9 ER316 | 18Cr-8Ni- Mo | ASTM A276-T316 | Note d | Note d |
| 11 | Monel *and Hardfaced | Note d | Ni-Cu Alloy | NA | MFG Standard | NA | Ni-Cu Alloy | MFG Standard | Note d | Note d |
| 350 i | Trim 5 or 5A | NA | NA | See Trim 5 or 5A | ||||||
| 12 | 316 and Hardfaced | Note d 350 i | 18Cr-8Ni-Mo | ASTM A351 (CF8M) | ASTM A182 (F316) | AWS A5.9 ER316 | 18Cr-8Ni- Mo | ASTM A276-T316 | Note d | Note d |
| Hardface per Trim 8 or 8A | NA | NA | Hardface per Trim 8 or 8A | |||||||
| 13 | Alloy 20 | Note d | 19Cr-29Ni | ASTM A351 (CN7M) | ASTM B473 | AWS A5.9 ER320 | 19Cr-29Ni | ASTM B473 | Note d | Note d |
| 14 | Alloy 20 and Hardfaced | Note d | 19Cr-29Ni | ASTM A351 (CN7M) | ASTM B473 | AWS A5.9 ER320 | 19Cr-29Ni | ASTM B473 | Note d | Note d |
| 350 i | Hardface per Trim 8 or 8A | NA | NA | Hardface per Trim 8 or 8A | ||||||
| 15 | Hardfaced | 350 e | Co-Cr A g | NA | NA | AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A | 18Cr-8Ni | ASTM A276-T304 | Note d | Note n |
| 16 | Hardfaced | 350 e | Co-Cr Ag | NA | NA | AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A | 18Cr-8Ni- Mo | ASTM A276-T316 | Note d | Note n |
| 17 | Hardfaced | 350 e | Co-Cr Ag | NA | NA | AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A | 18Cr- 10Ni-Cb | ASTM A276-T347 | Note d | Note n |
| 18 | Hardfaced | 350 e | Co-Cr Ag | NA | NA | AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A | 19Cr-29Ni | ASTM B473 | Note d | Note n |
| 19 | Nickel ** | Note d | Ni Alloy | MFG Standard ** | MFG Standard | MFG Standard ** | Ni Alloy ** | MFG Standard ** | Note d | Note n |
| 19A | Alloy 625 | Note d | Alloy 625 | ASTM A494 (CW6MC) | ASTM B564 UNS N06625 | AWS A5.14 ERNiCrMo-3 | Alloy 625 | ASTM B564 UNS N06625 | Note d | Note n |
API 600 Trim Number Chart (Seat Surface, Stem and Backseat Bushing)
-Continued
| Trim | Nominal Trim | Seating Surface Hardness (HB) Minimum a | Seating Surface Material Type b | Seating Surface Typical Specifications Grade | Stem/Backseat Bushing p | Stem Hardness (HB) | Backseat Bushing Hardness (HB) | |||
| Cast (Integral) | Cast (Integral) | Forged (Integral) | Welded m | Material Type b | Stem/Backseat Bushing p | |||||
| 19B | Alloy C276 | Note 61 | Alloy C276 | ASTM A494 (CW2M) | ASTM B564 UNS N10276 | AWS A5.14 ERNiCrMo-4 | Alloy C276 | ASTM B564 UNS N10276 | Note d | Note n |
| 19C | Alloy 825 | Note d | Alloy 825 | ASTM A494 (CU5MCuC) | ASTM B564 UNS N08825 | AWS A5.14 ERNiCrMo-3 | Alloy 825 | ASTM B564 UNS N08825 | Note d | Note n |
| 20 | Nickel ** and Hardfaced | Note d | Ni Alloy | MFG Standard ** | MFG Standard | MFG Standard ** | Ni Alloy ** | MFG Standard ** | Note d | Note n |
| 350 i | Co-CrA9 | NA | NA | AWS 5.13 ECoCr-A or AWS 5.21 ECoCr-A | ||||||
| 20A | Alloy 625 and Hardfaced | Note d | Alloy 625 | ASTM A494 (CW6MC) | ASTM B564 UNS N06625 | AWS A5.14 ERNiCrMo-3 | Alloy 625 | ASTM B564 UNS N06625 | Note d | Note n |
| 350 i | Co-CrA9 | NA | NA | AWS 5.13 ECoCr-A or AWS 5.21 ECoCr-A | ||||||
| 20B | Alloy C276 and Hardfaced | Note d | Alloy C276 | ASTM A494 (CW2M) | ASTM B564 UNS N10276 | AWS A5.14 ERNiCrMo-4 | Alloy C276 | ASTM B564 UNS N10276 | Note d | Note n |
| 350 i | Co-Cr A g | NA | NA | AWS 5.13 ECoCr-A or AWS 5.21 ECoCr-A | ||||||
API 600 Trim Number Chart (Seat Surface, Stem and Backseat Bushing)
-Continued
| Trim | Nominal Trim | Seating Surface Hardness (HB) Minimum a | Seating Surface Material Type b | Seating Surface Typical Specifications Grade | Stem/Backseat Bushing p | Stem Hardness (HB) | Backseat Bushing Hardness (HB) | |||
| Cast (Integral) | Forged (Integral) | Welded m | Material Type b | Typical Specifications Type | ||||||
| 20C | Alloy 825 and Hardfaced | Note d | Alloy 825 | ASTM A494 (CU5MCuC) | ASTM B564 UNS N08825 | AWS A5.14 ERNiCrMo-3 | Alloy 825 | ASTM B564 UNS N08825 | Note d | Note n |
| 350 i | Co-CrA g | NA | NA | AWS 5.13 ECoCr-A or AWS 5.21 ECoCr-A | ||||||
| 21 | Hardfaced | 350 e | Co-CrA g | NA | NA | AWS 5.13 ECoCr-A or AWS 5.21 ECoCr-A | Ni Alloy ** | MFG Standard ** | Note d | Note n |
Note:
Cr = Chromium; Ni = Nickel; Co = Cobalt; Cu = Copper; NA= Not Applicable.
* Monel is used strictly as an example of any nickel-copper alloy 400 matching UNS N04400 specifications. It does not constitute any endorsement of any specific product or company by API.
** Trim materials, including stem and base material for HF trim items, shall have a corrosion resistance and temperature limit at least equal to the valve body's corrosion resistance and pressure temperature rating.
a. HB (formerly BHN) is the symbol for the Brinell hardness per ASTM E10.
b. Free machining grades of 13Cr are prohibited.
c. Not used
d. Valve manufacturer's standard hardness.
e. Differential hardness between the body and disc seating surfaces is not required.
f. Case hardness by nitriding to a thickness of 0.13 mm (0.005 in.) minimum.
g. AWS A5.13 ECoCr-A or AWS A5.21 ERCoCr-A: This classification includes such trademark materials as Stellite 6? *, Stoody 6? * and Wallex 6? *. For Plasma Transfer Arc Welding (P7AW) process powder with the metallurgy equivalent to UNS R30006 can also be used. CoCr-E (Stellite 21 ? * or equal) may be used only with purchaser approval and typical CoCr-E alloys include AWS A5.13 ECoCr-E or AWS A5.21 ERCoCr-E. * Trademarks are examples only and do not constitute an endorsement of this product by API.
h. Manufacturer's standard hardfacing with a maximum iron content of 25 %.
i. Hardness differential between the body and disc seating surfaces shall be the manufacturer's standard.
j. Not used.
k. Manufacturer's standard with 30 Ni minimum.
l. Not used.
m. Typical backseat seating surface hardfacing or overlay, when specified.
n. Per manufacturer's standard if not hardfaced, 250 HB minimum if hardfaced.
p. For weld deposit on an integral backseat, the same nominal material and typical specification shall apply.
API 600 Trim Number Chart
