API R-type Gasket

　　The metallic ring pad is subject to forging, heat treatment and machining. It is a kind of metallic.The metallic ring pad is subject to forging, heat treatment and machining. It is a kind of metallic high-temperature, high-pressure valve covers, etc. The product is especially suitable to situations with pressure and temperature fluctuations to maintain fine sealing performance. Regular R-type pad is divided into oval type or octagonal type in terms of cross section. Standard R-type ring pad is manufactured according to API6A and ASMEB16.20 specifications. The maximum operational pressure is 10000PSI. In dovetail groove flange the octagonal pad and oval pad are interchangeable. RX-type octagonal pad is applicable for standard R-type rind pad with enhanced pressure and flange groove sealing face identical to that of the R-type.BX-type octagonal pad is applicable for systems with enhanced pressure and design application  as high as 15000PSI. We provide a variety of materials and types for different design and  operational requirements. Please refer to the table of material properties.
Note: When octagonal type is chosen, the material hardness of the pad should be 15~20HB lower than that of the flange face. It is recommended the pad is not recycled.

Applicable standards:
ANSI B16.5-1973 、 JPI-75-15-70 、 GB 699 、 GB1220 、 JB755 、 HG20633-97

Major forms of metallic ring pad:


Main technique parameters of metal gasket:

Material	Maximum hardness　BRINELL		Temperature（ ℃ ）	Abbreviations marker
	Brucellosis	Rockwell
Soft Iron	90	56	-60 500	D
Low Carbon Steel	120	68	-40～540	S
304SS	160	83	-250 540	304
304LSS	160	83	-250 540	304L
316SS	160	83	-200 815	316
316LSS	160	83	-200 815	316
321SS	160	83	-200 870	321
347SS	160	83	-200 870	347
410SS	170	86	-40 850	410
5Cr-0.5Mo	130		-29 650
Copper	80		-100 315
Aluminum	35		-200 425
Inconel 600	150		-100 1095
Incoloy 825	150		-100 1095
Monel 400	150		-100 760
Titanium	215		-200 540
Nickel 200 -	110		200 760
Hastelloy B2	230		-100 1095
Hastelloy C276	210		-100 1095

Notes for Order: The following parameters shall be noted in the order of metal gasket.
Example:
1. Type of metal gasket: R
2. Shape: Octagonal
3. Flange Standard: Ha20633
4. Gasket No.: P27
5. Material: 316L
6. Hardness: HB160
7. Diameter: DN100
8. Pressure: 11MPA