API 6A- VALVE MATERIAL SPECIFICATION
|
Material Class ¹ |
Service condition description |
Forging body material ² |
Temp ³ |
Casing body material ² |
Temp ³ |
Bonnet ² |
Bonnet seal ring |
Gate |
Stem |
Seat |
Stem seal |
|
AA |
general service Standard trim non-corrosive |
API 60K or 75K AISI 4130 Alloy steel |
API TEMP L-Y |
API 60K ASTM A487-4C alloy steel |
API TEMP L-Y |
API 60K or 75K AISI 4130 Alloy steel |
AISI 1018/1020 low carbon steel |
API 60K or 75K AISI 4130 nitrided |
API 60K or 75K AISI 4130 nitrided |
API 60K or 75K AISI 4130 nitrided |
PTFE+NBR GRAPHITE PEEK |
|
BB |
general service Stainless trim Slightly corrosive |
API 60K or 75K AISI 4130 Alloy steel |
API TEMP L-Y |
API 60K A STM A487-4C alloy steel |
API TEMP L-Y |
API 60K or 75K AISI 4130 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
ASTM A564 630 (17-4PH) stainless steel AISI 410 nitrided |
AISI 410 stainless steel nitrided |
PTFE+FKM GRAPHITE PEEK |
|
CC |
general service Full stainless Moderately corrosive |
API 75K AISI 410 stainless steel |
API TEMP L-Y |
API 75K ASTM A217 CA-15 stainless steel |
API TEMP L-Y |
API 75K AISI 410 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
ASTM A564 630 (17-4PH )stainless steel AISI 410 nitrided |
AISI 410 stainless steel nitrided |
PTFE+FKM GRAPHITE PEEK |
|
DD-NL |
Sour service Stanard trim Non-corrosive |
API 60K or 75K AISI 4130 Alloy steel |
API TEMP L-Y |
API 60K ASTM A487-4C alloy steel |
API TEMP L-Y |
API 60K or 75K AISI 4130 Alloy steel |
AISI 304 or 316 stainless steel |
API 60K or 75K, AISI 4130 nitrided |
API 60K or 75K AISI 4130 nitrided |
API 60K or 75K AISI 4130 nitrided |
PTFE+FKM GRAPHITE PEEK |
|
EE-0.5 |
Sour service Stainless trim Moderately corrosive |
API 60K or 75K AISI 4130 Alloy steel |
API TEMP L-Y |
API 60K ASTM A487-4C alloy steel |
API TEMP L-Y |
API 60K or 75K AISI 4130 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
ASTM A564 630 (17-4PH) stainless steel AISI 410 nitrided |
AISI 410 stainless steel nitrided |
PTFE+FKM GRAPHITE PEEK |
|
EE-1.5 |
Sour service Stainless trim Moderately corrosive |
API 60K or 75K AISI 4130 Alloy steel |
API TEMP L-Y |
API 60K ASTM A487-4C alloy steel |
API TEMP L-Y |
API 60K or 75K AISI 4130 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
Inconel 718/625 |
AISI 410 stainless steel nitrided |
PTFE+FKM GRAPHITE PEEK |
|
EE-NL |
Sour service Stainless trim Moderately corrosive |
API 60K or 75K AISI 4130 Alloy steel |
API TEMP L-Y |
API 60K , ASTM A487-4C alloy steel |
API TEMP L-Y |
API 60K or 75K AISI 4130 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
Inconel 718/625 |
AISI 410 stainless steel nitrided |
PTFE+FKM GRAPHITE PEEK |
|
FF-0.5 |
Sour service Full stainless Highly corrosive |
API 75K AISI 410 stainless steel |
API TEMP L-Y |
API 75K ASTM A217 CA-15 stainless steel |
API TEMP L-Y |
API 75K AISI 410 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
ASTM A564 630 (17-4PH)stainless steel nitrided |
AISI 410 stainless steel nitrided |
PTFE+HNBR GRAPHITE PEEK |
|
FF-1.5 |
Sour service Full stainless Highly corrosive |
API 75K AISI 410 stainless steel |
API TEMP L-Y |
API 75K ASTM A217 CA-15 stainless steel |
API TEMP L-Y |
API 75K AISI 410 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
Inconel 718/625 |
AISI 410 stainless steel nitrided |
PTFE+HNBR GRAPHITE PEEK |
|
FF-NL |
Sour service Full stainless Highly corrosive |
API 75K AISI 410 stainless steel |
API TEMP L-Y |
API 75K ASTM A217 CA-15 stainless steel |
API TEMP L-Y |
API 75K AISI 410 Alloy steel |
AISI 304 or 316 stainless steel |
AISI 410 stainless steel nitrided |
Inconel 718/625 |
AISI 410 stainless steel nitrided |
PTFE+HNBR GRAPHITE PEEK |
|
HH |
Sour service resistant alloy Highly corrosive |
API 75K AISI 4130 Alloy steel W/625 claded |
API TEMP L-Y |
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------ |
API 75K AISI 4130 Alloy steel W/62S claded |
Inconel 825 resistant alloy per NACE |
Inconel 718/625 W/hard facing |
Inconel 718/625 |
Inconel 718/625 W/ hard facing |
PTFE+HNBR GRAPHITE PEEK |
Material Class ¹ AA, BB, CC, DD-NL, EE-0.5, EE-1.5, EE-NL, FF-0.5, FF-1.5, FF-NL, HH
Notes: This trim chart provides information on materials included in standard valves . Special materials, trims and con?gurations are available
upon customer request. 10,000-15,000 psi slab gate valves and gate valves with ball screw operators have unique trim charts. Please refer to their respective section of the brochure for details.
1. Materials for sour service to latest edition of NACE MR0175. Alternate materials are available, for special material classes designated by API or project requirements. Explanation of suf?xes for material classes DD, EE and FF:
0,5 = 0.5 psia maximum partial pressure of H2S.
1,5 = 1.5 psia maximum partial pressure of H2S.
NL = no limit to H2S.
API material class ZZ may be used when materials that have previously been used for sour service will not comply , with , ;current NACE MR0175/ISO standards
2. Charpy impact test results provided as required by API temperature rating and material class.
3. API temperature ratings X and Y require working pressure of valve to be de-rated as per API 6A annex G.
4. Nitriding is standard on all gates and seat. Hardfacing with tungsten carbide or HF6 also available upon request.
5. ASTM A564 Gr 630&nb, sp;(17-4 ph) HH1150 stems are not acceptable for sour service above 0.5 psia of H2S. corrosion resistant alloys per NACE MR0175/ISO standards are recommended
6. Teflon inserts standard - metal to metal seats used if requested by customer or for equipment manufactured for use in elevated temperature service (API temp ratings X & Y)
