S44660
Detail


S44600 is a ferritic, heat resisting, stainless chromium steel, characterized by:

Good resistance to reducing sulphurous gases

Very good resistance to oxidation in air

good resistance to oil-ash corrosion

Resistance to molten copper, lead and tin


This steel can be used at temperatures up to 1075°C (1970°F). However, allowance should be made for the low creep strength at the highest temperatures in order to avoid distortion due to the mass of the steel.


Standards

ASTM: 446-1/446-2

UNS: S44600

Pipe standard: ASTM A268


Chemical Composition

S44600

C

Si

Mn

P

S

Cr

Ni

Mo

Ti+Nb

Requirements

≤0.030

≤1.0

≤1.00

≤0.040

≤0.030

25.0-28.0

1.0-3.5

3.0-4.0

0.02-1.0

Actual

0.018

0.24

0.20

0.0067

0.0004

25.67

3.12

3.35

0.58


Mechanical properties

Properties

Tensile Strength

Min.(Mpa)

Yield Strength Min.(Mpa)

Elognation

Min. %

Hardness

(Brinell)

Requirement

585

450

20

265

Actual

630

535

35

210


Application

The S44600 is used in corrosion, corrosion and stress corrosion of the chloride by chloride.Due to its high strength, low expansion coefficient and thermal conductivity of thin passivation membrane, very suitable for heat exchange tube material, widely used in power plant condenser, chemical, petrochemical, refining, desalination, flue gas heat recovery heat exchanger etc

The performance rating of selected materials used in different environment of power plant


Material

C44300

C71500

TP304L

TP316L

TP439

S32205

N08637

Ti2

S44600

Chloride pitting

4

2

5

4

5

2

1

1

1

Chlorids stress corrosion craking

1

1

5

5

1

3

3

1

2

Corrosion

5

3

2

2

2

1

1

2

1

Steam droplet corrosion

5

3

2

2

2

1

1

2

1

Antiknock characteristics

5

4

2

2

2

2

2

5

1

Ammonia stress corrosion

5

3

1

1

1

1

1

1

1

Corrosion resistance of

5

4

3

3

4

2

1

1

1

Corrosion resistance of sulphur

3

2

5

4

5

3

1

1

1

Hydrogen embrittlement

1

1

1

1

1

1

1

5

4