CR32W+ | Paralloy Group | Paralloy Group

20/32 Cr/Ni Nb 0.1% C

Cast Heat Resisting Alloy
Steam Reforming

Application

A Low Carbon, Weldable Chromium Nickel, Niobium-Bearing Heat And Corrosion Resistant Steel

CR32W+ was developed primarily for applications up to 1000°C that are subjected to high stresses, thermal fatigue or even thermal shock. For many years, CR32W+ has been widely used for outlet headers or “manifolds” in reformer furnaces, and for collectors and transfer lines in pyrolysis plants such as ethylene furnaces. The low carbon content helps maintain tensile ductility after service ageing, and careful composition control provides the high creep ductility to assist relaxation of weld-zone residual stresses in thick sections. CR32W+ is also recommended for heat treatment furnace fixtures or any equipment that is subjected to rapid thermal cycling

CR32W+ is a low carbon, weldable chromium nickel, niobium-bearing heat and corrosion resistant steel, which is a cast alternative to wrought 20/32 Cr/Ni grades and equivalent of CT15C / ASTM A351.

Niobium is a major strengthening addition and the composition is carefully ‘balanced’ to ensure that the alloy offers an excellent combination of creep and thermal fatigue strength, ductility, weldability and corrosion resistance CR32W is readily welded by metal arc (SMAW) or inert gas shielded arc (GTAW, GMAW) welding process using matching filler material.

Nominal Composition

6
C Carbon

0.1
14
Si Silicon

0.8
25
Mn Maganese

1
24
Cr Chromium

20
28
Ni Nickel

32
43
Nb Niobium

1.2
Plus
Additions

Physical Properties

Coefficient of Thermal Expansion (mm/mm°C)	Thermal Conductivity (W/m°K)	Density (kg/m³)	Young Modulus (N/mm² x 10³)	Specific Heat (J/KgK)
20 – 100°C – 14.5 x 10⁻⁶	100°C – 13.4	7.94 x 10³	20°C - 155	502
20 – 750°C – 17.5 x 10⁻⁶	750°C – 25.9		800°C - 105.5
20 – 1000°C – 18.5 x 10⁻⁶	1000°C – 30.5		1000°C - 95.8

Coefficient of Thermal Expansion (mm/mm°C)

Thermal Conductivity (W/m°K)

Density (kg/m³)

Young Modulus

(N/mm² x 10³)

Specific Heat (J/KgK)

20 – 100°C – 14.5 x 10⁻⁶

100°C – 13.4

7.94 x 10³

20°C - 155

502

20 – 750°C – 17.5 x 10⁻⁶

750°C – 25.9

800°C - 105.5

20 – 1000°C – 18.5 x 10⁻⁶

1000°C – 30.5

1000°C - 95.8

Mechanical Properties

Download specifications

UTS (N/mm²) 448
Proof Stress 0.2% (N/mm²) 175
Elongation (%) 25
Temperature (°C) UTS (N/mm²) 0.2% (N/mm²) Elongation (%)
700°C 296 125 39
800°C 196 106 49
900°C 102 76 67
1000°C 68 56 75

Temp (°C)	10,000 Hour Life		50,000 Hour Life		100,000 Hour Life
	Minimum	Mean	Minimum	Mean	Minimum	Mean
750	73.53	79.73	63.32	68.66	59.13	64.12
775	65.20	70.70	55.32	59.99	51.32	55.65
800	57.31	62.15	47.89	51.93	44.13	47.85
825	49.94	54.16	41.07	44.54	37.58	40.75
850	43.14	46.78	34.90	37.85	31.70	34.37
875	36.94	40.06	29.38	31.86	26.49	28.72
900	31.36	34.01	24.51	26.58	21.92	23.77
925	26.39	28.62	20.26	21.96	17.97	19.49
950	22.01	23.87	16.59	17.99	14.60	15.83
975	18.20	19.74	13.46	14.59	11.74	12.73
1000	14.92	16.18	10.82	11.73	9.36	10.15

Download specifications

UTS (N/mm²)	448
Proof Stress 0.2% (N/mm²)	175
Elongation (%)	25

Temperature (°C)	UTS (N/mm²)	0.2% (N/mm²)	Elongation (%)
700°C	296	125	39
800°C	196	106	49
900°C	102	76	67
1000°C	68	56	75

Temp (°C)	10,000 Hour Life		50,000 Hour Life		100,000 Hour Life
	Minimum	Mean	Minimum	Mean	Minimum	Mean
750	73.53	79.73	63.32	68.66	59.13	64.12
775	65.20	70.70	55.32	59.99	51.32	55.65
800	57.31	62.15	47.89	51.93	44.13	47.85
825	49.94	54.16	41.07	44.54	37.58	40.75
850	43.14	46.78	34.90	37.85	31.70	34.37
875	36.94	40.06	29.38	31.86	26.49	28.72
900	31.36	34.01	24.51	26.58	21.92	23.77
925	26.39	28.62	20.26	21.96	17.97	19.49
950	22.01	23.87	16.59	17.99	14.60	15.83
975	18.20	19.74	13.46	14.59	11.74	12.73
1000	14.92	16.18	10.82	11.73	9.36	10.15