Alloy28

HuaNickel Alloy28 alloy is an iron-nickel-based ultra-low carbon austenitic alloy. Excellent corrosion resistance in harsh corrosive media in the chemical industry; In wet phosphoric acid, it has good overall corrosion resistance, and also has excellent resistance to pitting corrosion, crevice corrosion, intergranular corrosion, stress corrosion and other properties. The process properties of this alloy are similar to those of general austenitic stainless steels. In view of its excellent comprehensive properties, the alloy has been widely used in chemical processing, oil and gas field development and other industries in recent years.

Alloy28 Chemical composition：

	Fe	Ni	Mo	Cu	S	Cr	C	Si	Mn	P	S
Min	Bal	30	3	0.6	0.04	26	≤
Max		34	4	1.4	0.07	28	0.03	1	2.5	0.03	0.03

Alloy28Physical properties：

Density/g·cm-3	8.0
Temperature/℃	20	100	200	300	400
Specific heat capacity/J·(kg·℃)-1	450	470	490	510	530
Temperature/℃	20	100	200	300	400
Resistivity/μΩ ·m	0.99	1.07	1.16	1.22	1.25
Temperature/℃	20	100	200	300	400
Thermal conductivity/W·(m·℃)-1	11.4	12.9	14.3	15.3	16.7
Temperature/℃	20～100	20～200	20～300	20～400
Coefficient of linear expansion/(10-6℃)-1	15.0	15.5	16.0	16.5

Alloy28Mechanical properties：

Alloy state	Temperature/℃	Mechanical properties
		σb/MPa	σp0.2/MPa	δ/%	P/%	E/×103
Solution processing status	20 100 200 300 400	500～750	≥220 ≥190 ≥160 ≥150 135	35   一	一 一	200 105 190 180 170

Alloy28Alloy properties：

HuaNickel Alloy28 alloy is a non-magnetic completely austenitic structure, but after a long time of aging at 500~720 °C, it will precipitate carbides and intermetallic phases (σ,x) that are harmful to performance on the matrix and grain boundaries.

Alloy28Uses of alloys：

Alloy28 alloy is mainly used in the production of wet phosphoric acid.

Alloy28Process performance：

Welding process: HuaNickel Alloy28 has good welding performance and no tendency to crack hot. There is no need for preheating before welding, no heat treatment is required after welding, and conventional welding methods such as manual arc welding and TIG welding can be used. The most ideal method is TIG welding.

Heat treatment: solution annealing temperature is 1080~1140 °C, the holding time depends on the maximum cross-sectional size of the workpiece, the cooling method is water cooling, and rapid air cooling can also be used for small cross-sectional sizes.

Relevant standards：

ASTM B 668、EN 10216-5、SEW 400、SS 14 25 84、NFA 49-217、ASTM B 709、EN 10088-2、SS 14 25 84、EN 10088-3、EN 10272、SS 14 25 84、ASTM A 403、ASTM B668