Hastelloy C2000 Composition

Hastelloy C2000 is a nickel-chromium-molybdenum alloy developed by Haynes International as an advanced evolution of the widely used Hastelloy C276.

Introduced in the late 1990s, C2000 was specifically engineered to combine the superior resistance of C276 to reducing environments with dramatically improved resistance to oxidizing media, including ferric ions, cupric ions, and strong oxidants such as nitric acid and hydrochloric acid mixtures.

The nominal chemical composition of Hastelloy C2000 (as per ASTM B575, B564, B366, and B462) is presented below:

Element	Weight % (Nominal)	Typical Range (Actual)	Purpose & Effect
Nickel (Ni)	Balance	Remainder	Primary matrix element; provides base corrosion resistance and ductility
Chromium (Cr)	23.0	22.0 – 24.0	Enhances resistance to oxidizing environments and localized corrosion (pitting/crevice)
Molybdenum (Mo)	16.0	15.0 – 17.0	Major contributor to resistance in reducing acids (HCl, H₂SO₄) and pitting resistance
Copper (Cu)	1.6	1.3 – 1.9	Unique addition that significantly improves resistance to sulfuric and hydrochloric acids, especially in oxidizing impurities
Iron (Fe)	≤3.0	≤2.0 typical	Kept low to maintain corrosion performance
Cobalt (Co)	≤2.0	≤1.0 typical	Limited to reduce risk of phase instability
Manganese (Mn)	≤0.50	≤0.30 typical	Deoxidizer and machinability aid
Silicon (Si)	≤0.08	≤0.05 typical	Strictly limited to prevent deleterious silicide formation
Carbon (C)	≤0.010	≤0.008 typical	Ultra-low to avoid sensitization and intergranular corrosion
Phosphorus (P)	≤0.025	≤0.015 typical	Controlled to minimize hot cracking and embrittlement
Sulfur (S)	≤0.010	≤0.005 typical	Extremely low to enhance weldability and corrosion resistance
Aluminum (Al)	≤0.50	≤0.20 typical	Limited; excess can form detrimental phases

Higher Chromium: Dramatically improves resistance to oxidizing species such as Fe³, Cu², and nitric acid.

Addition of Copper: A deliberate and patented addition that synergistically enhances performance in sulfuric acid and HCl-containing environments with oxidizing contaminants. This is the most distinguishing feature of C2000.

Higher Molybdenum: Maintains excellent resistance to reducing acids while supporting pitting and crevice corrosion resistance.

Ultra-low Carbon and Silicon: Ensures thermal stability and resistance to intergranular attack even after prolonged exposure in the 600–1000°C range.

Virtually immune in hydrochloric acid up to 70 °C at all concentrations.

Excellent resistance in sulfuric acid up to 80 °C, even with oxidizing impurities.

Superior performance in wet chlorine, hypochlorite, and chlorine dioxide.

Outstanding resistance to pitting and crevice corrosion in seawater and brine.

info-337-148

Nominal Pipe Size(NPS)	DN	Outside Diameterat Bevel	Center-to-End
Nominal Pipe Size(NPS)	DN	Outside Diameterat Bevel	Run, C	Outlet, M [Notes (1) and (2)]
1/2	15	21.3	25	25
3/4	20	26.7	29	29
1	25	33.4	38	38
1 1/4	32	42.2	48	48
1 1/2	40	48.3	57	57
2	50	60.3	64	64
2 1/2	65	73.0	76	76
3	80	88.9	86	86
3 1/2	90	101.6	95	95
4	100	114.3	105	105
5	125	141.3	124	124
6	150	168.3	143	143
8	200	219.1	178	178
10	250	273.0	216	216
12	300	323.8	254	254
14	350	355.6	279	279
16	400	406.4	305	305
18	450	457	343	343
20	500	508	381	381
22	550	559	419	419
24	600	610	432	432
26	650	660	495	495
28	700	711	521	521
30	750	762	559	559
32	800	813	597	597
34	850	864	635	635
36	900	914	673	673
38	950	965	711	711
40	1000	1016	749	749
42	1050	1067	762	711
44	1100	1118	813	762
46	1150	1168	851	800
48	1200	1219	889	838

GENERAL NOTE: All dimensions are in millimeters.

NOTES:

(1) Outlet dimension M for NPS 26 (DN 650) and larger is recommended but not required.

(2) Dimensions applicable to crosses NPS 24 (DN 600) and smaller.

info-549-181

Nominal Pipe Size (NPS)	DN	Outside Diameter at Bevel Run Outlet		Center-to-End
Nominal Pipe Size (NPS)	DN	Outside Diameter at Bevel Run Outlet		Run, C	Outlet, M [Note (1)]
1/2 x 1/2 x 3/8	15 × 15 × 10	21.3	17.3	25	25
1/2 x1/2 x 1/4	15 × 15 × 8	21.3	13.7	25	25
3/4 x 3/4 x1/2	20 × 20 × 15	26.7	21.3	29	29
3/4 x 3/4 x 3/8	20 × 20 × 10	26.7	17.3	29	29
1 × 1 x 3/4	25 × 25 × 20	33.4	26.7	38	38
1 × 1 x 1/2	25 × 25 × 15	33.4	21.3	38	38
1 1/4 x 1 1/4 × 1	32 × 32 × 25	42.2	33.4	48	48
1 1/4 × 1 1/4 × 3/4	32 × 32 × 20	42.2	26.7	48	48
1 1/4 x 1 1/4 x 1/2	32 × 32 × 15	42.2	21.3	48	48
1 1/2 x 1 1/2 x 1/4	40 × 40 × 32	48.3	42.2	57	57
1 1/2 x 1 1/2 × 1	40 × 40 × 25	48.3	33.4	57	57
1 1/2 x 1 1/2 x 3/4	40 × 40 × 20	48.3	26.7	57	57
1 1/2 x 1 1/2x 1/2	40 × 40 × 15	48.3	21.3	57	57
2 × 2 × 1 1/2	50 × 50 × 40	60.3	48.3	64	60
2 × 2 × 1 1/4	50 × 50 × 32	60.3	42.2	64	57
2 × 2 × 1	50 × 50 × 25	60.3	33.4	64	51
2 × 2 × 3/4	50 × 50 × 20	60.3	26.7	64	44
2 1/2 x 2 1/2 × 2	65 × 65 × 50	73.0	60.3	76	70
2 1/2 x 2 1/2 x 1 1/2	65 × 65 × 40	73.0	48.3	76	67
2 1/2 × 2 1/2 × 1 1/4	65 × 65 × 32	73.0	42.2	76	64
2 1/2 × 2 1/2 × 1	65 × 65 × 25	73.0	33.4	76	57
3 × 3 × 2 1/2	80 × 80 × 65	88.9	73.0	86	83
3 × 3 × 2	80 × 80 × 50	88.9	60.3	86	76
3 × 3 × 1 1/2	80 × 80 × 40	88.9	48.3	86	73
3 × 3 × 1 1/4	80 × 80 × 32	88.9	42.2	86	70
3 1/2 x 3 1/2 × 3	90 × 90 × 80	101.6	88.9	95	92
3 1/2 × 3 1/2 × 2 1/2	90 × 90 × 65	101.6	73.0	95	89
3 1/2 × 3 1/2 × 2	90 × 90 × 50	101.6	60.3	95	83
3 1/2 × 3 1/2 × 1 1/2	90 × 90 × 40	101.6	48.3	95	79
4 × 4 × 3 1/2	100 × 100 × 90	114.3	101.6	105	102
4 × 4 × 3	100 × 100 × 80	114.3	88.9	105	98
4 × 4 × 2 1/2	100 × 100 × 65	113.3	73.0	105	95
4 × 4 × 2	100 × 100 × 50	114.3	60.3	105	89
4 × 4 × 1 1/2	100 × 100 × 40	114.3	48.3	105	86
5 × 5 × 4	125 × 125 × 100	141.3	114.3	125	117
5 × 5 × 3 1/2	125 × 125 × 90	141.3	101.6	124	114
5 × 5 × 3	125 × 125 × 80	141.3	88.9	124	111
5 × 5 × 2 1/2	125 × 125 × 65	141.3	73.0	124	108
5 × 5 × 2	125 × 125 × 50	141.3	60.3	124	105