DSA™ D22

Features and Chemical Compositions

Gas corrosion resistance comparable to DSALOY™22 (UNS N06022 / Hastelloy® C-22® equivalent), with reduced alloy content. Superior machinability to DSALOY22.

※DSA is registered trademark or trademark of Daido Steel Co., Ltd.

※DSALOY are registered trademarks or trademarks of Daido Steel Co., Ltd.

※Hastelloy and C-22 are registered trademarks of Haynes International, Inc.

	Chemical Composition (mass%)
	Ni	Cr	Mo	Fe	W	Co	V	C	Si	Mn	P	S
DSALOY22 (UNS N06022) (Hastelloy C-22)	Bal.	20.0 -22.5	12.5 -14.5	2.0 -6.0	2.5 -3.5	≤2.5	≤0.35	≤0.015	≤0.08	≤0.50	≤0.02	≤0.02
DSA D22	Bal.	23	9	16	≤1.0	≤2.5	≤0.35	≤0.015	≤0.08	≤0.50	≤0.02	≤0.02

Gas corrosion resistance

The penetration depths of halogens were measured after a 5-hour exposure to dry HF, HCl, and HBr at 250°C (482°F). The results confirm that gas corrosion resistance is comparable to that of DSALOY22 against all gas types.

Gas Corrosion Test Results (Halogen Penetration Depth Comparison)

HF, 250°C (482°F)

HCl, 250°C (482°F)

HBr, 250°C (482°F)

Gas Corrosion Test Procedure

Schematic of Gas Corrosion Test Equipment

Test Conditions

Gas type	HF, HCl, HBr
Gas Concentration	100%
Pressure	133Pa (1Torr)
Temperature	250℃
Humidity control	None (Dry)

※Specimens were analyzed by XPS after testing.

Equipment Specifications

Temperature	Max. 800°C (1472°F)
Pressure	10Pa ～ 90kPa
Humidity control	Possible：≥ 10% at 25°C (77°F)

Machinability

In both drilling life and turning tests, DSA D22 demonstrated superior machinability compared to DSALOY22.

Drilling life test

Turning test

Mechanical and Physical Properties

Mechanical Properties

After Annealing
0.2% Yield Strength, MPa	Tensile Strength, MPa	Elongation, %	Reduction of Area, %
290	650	59	81

Physical Properties

Coefficient of Linear Thermal Expansion (CTE)

°C (°F)	30～100 (86-212)	30～200 (86-392)	30～300 (86-572)	30～400 (86-752)	30～500 (86-932)	30～600 (86-1112)	30～700 (86-1292)	30～800 (86-1472)	30～900 (86-1652)
×10^-6/°C (×10^-6/°F)	12.4 (6.9)	13.2 (7.3)	13.6 (7.6)	14.0 (7.8)	14.2 (7.9)	14.6 (8.1)	15.1 (8.4)	15.6 (8.7)	16.0 (8.9)

Thermal Conductivity and Specific Heat

Temperature °C (°F)	25 (77.0)	100 (212)	200 (392)	300 (572)	400 (752)	500 (932)	600 (1112)	700 (1292)	800 (1472)	900 (1652)
Thermal Conductivity, W/(m・K)	10.1	11.5	13.0	14.6	16.6	18.4	20.6	22.6	24.8	26.3
Specific Heat, J/(kg・K)	421	434	445	460	479	496	520	538	583	596

Young’s and Shear Moduli

Temperature °C (°F)	24 (75.2)	100 (212)	200 (392)	300 (572)	400 (752)	500 (932)	600 (1112)	700 (1292)	800 (1472)	900 (1652)
Young’s Modulus, GPa	196.7	193.2	188.2	182.8	177.8	172.9	166.5	158.9	150.0	141.1
Shear Modulus, GPa	74.6	73.4	71.5	69.5	67.6	65.8	63.4	60.6	57.5	54.2

Density

°C (°F)	25 (77.0)
kg/m³	8.34 × 10³