Inconel 600 flanges manufactured to ASME B16.5 are usually made from two forms of raw material: ASTM B564 UNS N06600 forgings or ASTM B168 UNS N06600 plates (only blind or plate flanges can be made of Inconel 600 plates; the material shall be furnished in annealed condition). According to the standard, the pressure-temperature ratings can be furnished in two unit systems: ISO and US customary.

Pressure-Temperature Ratings for Inconel 600: ISO Unit

Temp. °C	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-29 to 38	20.0	51.7	68.9	103.4	155.1	258.6	430.9
50	19.5	51.7	68.9	103.4	155.1	258.6	430.9
100	17.7	51.5	68.7	103.0	154.6	257.6	429.4
150	15.8	50.3	66.8	100.3	150.6	250.8	418.2
200	13.8	48.6	64.8	97.2	145.8	243.4	405.4
250	12.1	46.3	61.7	92.7	139.0	231.8	386.2
300	10.2	42.9	57.0	85.7	128.6	214.4	357.1
325	9.3	41.4	55.0	82.6	124.0	206.6	344.3
350	8.4	40.3	53.6	80.4	120.7	201.1	335.3
375	7.4	38.9	51.6	77.6	116.5	194.1	323.2
400	6.5	36.5	48.9	73.3	109.8	183.1	304.9
425	5.5	35.2	46.5	70.0	105.1	175.1	291.6
450	4.6	33.7	45.1	67.7	101.4	169.0	281.8
475	3.7	31.7	42.3	63.4	95.1	158.2	263.9
500	2.8	28.2	37.6	56.5	84.7	140.9	235.0
538	1.4	16.5	22.1	33.1	49.6	82.7	137.9
550	…	13.9	18.6	27.9	41.8	69.7	116.2
575	…	9.4	12.6	18.9	28.3	47.2	78.6
600	…	6.6	8.9	13.3	19.9	33.2	55.3
625	…	5.1	6.8	10.3	15.4	25.7	42.8
650	…	4.7	6.3	9.5	14.2	23.6	39.4

*Working pressures by classes, unit: bar.

Pressure-Temperature Ratings for Inconel 600: US Customary Unit

Temp. °F	Class 150	Class 300	Class 400	Class 600	Class 900	Class 1500	Class 2500
-20 to 100	290	750	1,000	1,500	2,250	3,750	6,250
200	260	750	1,000	1,500	2,250	3,750	6,250
300	230	730	970	1,455	2,185	3,640	6,070
400	200	705	940	1,410	2,115	3,530	5,880
500	170	665	885	1,330	1,995	3,325	5,540
600	140	605	805	1,210	1,815	3,025	5,040
650	125	590	785	1,175	1,765	2,940	4,905
700	110	570	755	1,135	1,705	2,840	4,730
750	95	530	710	1,065	1,595	2,660	4,430
800	80	510	675	1,015	1,525	2,540	4,230
850	65	485	650	975	1,460	2,435	4,060
900	50	450	600	900	1,350	2,245	3,745
950	35	365	485	725	1,090	1,815	3,030
1,000	20	240	320	480	720	1,200	2,000
1,050	…	155	205	310	465	770	1,285
1,100	…	105	135	205	310	515	855
1,150	…	75	100	150	225	375	630
1,200	…	70	90	135	205	345	570

*Working pressures by classes, unit: psig.