Special Stainless Steel


Special Stainless Steel
YST series

Corrosion and wear resistant special alloy for various kinds of liquid

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YST Alloy (Corrosion and wear resistant special stainless steel casting)

YOKOTA's special stainless steel casting, YST series, with enhanced pitting and crevice corrosion resistance as well as wear resistance, has been favorably received as a standardized material suitable for pumps and valves in equipment for anti-pollution treatment, seawater treatment, and chemical processing among others.
In particular, this YST Alloy has been adopted as the pump material for wet-type smoke discharging desulfurizers under a variety of severely corrosive and abrasive conditions, proving its excellent durability and reliability even under severe conditions.
Moreover, YOKOTA's duplex stainless steel YST130N, not only shows outstanding seawater resistance, but also is applicable to many different types of liquid as an excellent corrosion and wear resistant material.


Characteristics of YST Alloy

Compared with JIS materials such as SCS13, SCS14, and Carpenter 20 (SCS23), a widely used corrosion resistant material, YST Alloy has the following advantages:

Excellent corrosion resistance, and especially effective against local corrosion due to chloric ion conditions.

Improved wear resistance due to improved hardness, resulting in both corrosion resistance and wear resistance.

Excellent resistance to pitting and crevice corrosion in seawater.

Outstanding strength (nearly twice as strong as general JIS materials).

Easily welded by covered arc or TIG welding without preheating or residual heating.


Fluorescence X-ray spectroscopy system
Fluorescence X-ray spectroscopy system

Applications of YST Alloy

Wet-type flue gas desulfurizer (

More details >

"Current Topics: Slurry Self-Priming" )

Wet-type flue gas desulfurizer drainage treatment system

Acid-containing drainage treatment system for semiconductor plant

Incinerator drainage treatment system

Sewage treatment system (

More details >

"Current Topics: Sewage Treatment" )

Refinery wastewater treatment system (

More details >

"Current Topics: Steel Works" )

Boiler/Scrubber circulating system

Seawater desalination system

Seawater pump (

More details >

"Current Topics: Seawater Intake","Aquarium","Undersea Tunnel")

Pulp and paper process water

Electroplating wastewater

Processes subject to corrosion and wear (

More details >

"Current Topics: Slurry Self-Priming" )

Other



Wear resistant high Cr steel casting

Developed for sand pump material, wear resistant high Cr steel casting (CCR10) is used in pumps for construction work, sedimentation ponds, and also used in pumps to treat lime-gypsum liquid and other high density, slurry liquid.



Chemical composition

Unit: %

Metallographic structure
Material
Chemical composition
C
Si
Mn
Ni
Cr
Mo
Others
YOKOTA
material
Austenite
YST20
<=0.05
<=1.5
<=1.5
10-14
17-20
2-4
Special elements
YST30
<=0.05
<=1.5
<=1.5
16-18
18-21
4-6
Special elements
YST40
<=0.05
<=1.5
<=1.5
23-27
18-22
5-7
Special elements
Duplex
YST130A
<=0.05
0.8-1.5
<=1.5
6-8
25-28
2-4
Special elements
YST130B
<=0.05
0.8-1.5
<=1.5
6-8
25-28
2-4
Special elements
YST130N
<=0.05
<=1.5
<=1.5
6-8
25-28
2-4
Special elements
High chromium
CCR10
<=2.5
<=1.5
<=1.5
0
14-18
0
Special elements
JIS material
(for reference)
Duplex
SCS10
<=0.03
<=1.5
<=1.0
4.5-8.5
21-26
2.5-4
0N : 0.08-0.3
SCS11
<=0.08
<=1.5
<=1.0
4-7
23-27
1.5-2.5
-
Austenite
SCS14
<=0.08
<=2.0
<=2.0
10-14
17-20
2-3
-
SCS23
<=0.07
<=2.0
<=2.0
27.5-30
19-22
2-3
Cu : 3-4


Mechanical properties

Metallographic structure
Material
Tensile strength
Durability
Elongation
Hardness
(N/mm2)
(N/mm2)
(%)
(Hv)
YOKOTA
material
Austenite
YST20
>=585
>=390
>=10
200-250
YST30
>=585
>=390
>=10
200-250
YST40
>=585
>=390
>=10
200-250
Duplex
YST130A
>=735
>=540
>=10
300-350
YST130B
>=685
>=490
>=5
350-400
YST130N
>=635
>=440
>=10
250-300
High chromium
CCR10
>=635
-
-
450-600
JIS material
(for reference)
Duplex
SCS10
>=620
>=390
>=15
<=319
SCS11
>=590
>=345
>=13
<=253
Austenite
SCS14
>=440
>=185
>=28
<=192
SCS23
>=390
>=165
>=30
<=192


Corrosion resistance, Wear resistance

Fig.1 All-surface corrosion resistance

Special stainless steel / All-surface corrosion resistance

Fig.2 Pitting corrosion resistance

Special stainless steel / Pitting corrosion resistance

As Fig.1 and 2 show, YST Alloy has excellent local corrosion resistance especially to liquids containing chloric ion, in addition to all-surface corrosion resistance. Fig.3 shows that YST Alloy also has excellent wear resistance, thus being suitable for various kinds of liquid.

Fig.3 Corrosion resistance and wear resistance

Special stainless steel / Corrosion and wear resistance

Fig.4 Wear resistance (Rate of wear, counting the wear of SUS316 by 20% slurry as 100)

Special stainless steel / Wear resistance

Fig.5 Corrosion resistance and wear resistance (Rate of wear, counting the wear of SUS316 by 5% slurry as 100)

Special stainless steel / Corrosion and wear resistance
YST130N is more suitable than YST130A for highly corrosive slurry liquid.


Features
Structure
Technical data
Selection & Dimensions
Inquiry form


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