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BUSINESS

Plasma Business Department

Stainless steel & special alloy steel

Welcome to Sambu Stainless Forging Co., Ltd., a specialist supplier of stainless steel and special alloy materials.

Business

Sambu Stainless Steel Forging specializes in stainless plate cutting and holds a large inventory of major stainless-steel grades, 304(l) and 316(L), ranging from 9T to 100 T. The company has adopted the latest plasma cutting M/C and the latest PC/NC operation method from HYOERTHEM in the United States and has many years of experience in performing large-scale cutting (maximum width: 3200mm ~ maximum length: 12500mm) and complex model cutting.

01Plasma cutting

Plasma cutting is a method that melts and removes the material to be cut by narrowing the arc using a metal nozzle and intensively projecting a high temperature, flow rate, and high energy density beam onto the cutting area.

02Applications
Shipbuilding
Equipment
Heat Exchanger
Chemical Facility
Power Plant
03Products
[Standard]
[Special]
[Weight calculation]
Square,Model Thickness X (Horizontal +Cutting loss) X (Vertical +Cutting loss) X Specific Gravity X Quantity
Cutting loss Table
Thickness Circle Square
10~50T 10 5
51T~80T 15 10
81T~100T 20 20
Circle Thickness X (Horizontal +Cutting loss) X (Vertical +Cutting loss) X * Specific Gravity X Quantity
Specific Gravity
Specific Gravity Strength
7.93 304, 304L, 321
7.98 316, 316L, 309S, 347, 317
04 WHAT IS STAINLESS STEEL?
[ ETYMOLOGY OF STAINLESS STEEL ]
The suffix LESS, referring to the absence of something, is added to STAIN, referring to rust, therefore denoting steel that does not easily rust.
[ HISTORY OF STAINLESS STEEL ]
The suffix LESS, referring to the absence of something, is added to STAIN, referring to rust, therefore denoting steel that does not easily rust.
[ WHY STAINLESS STEEL DOES NOT RUST EASILY ]
When stainless steel contains 12% chromium (Cr), the main component, it naturally forms a very thin Cr2O3 (10~50Å) layer (passivity layer), which blocks oxygen from entering the metal matrix, making it resistant to rusting.
Addition of
Cr to steel
  • Knife Blade(1.5%Cr)
  • When added: Poor molding
  • A small amount added: severe rust generation
  • Study of corrosion characteristics (1820) M. Faraday (England)
13% Cr
17% Cr
  • 1904 ~ 1909
  • Glesen (Germany)
  • L.Guillet, A. Portevin (France)
Ferrite
Martensite
Austenite
  • L.Guillet (France) announced three types of stainless steel
  • 1910 ~ 1915 (corrosion characteristics research)
  • Austenitic: Maurer, Strauss (Germany)
  • Ferrite type: Danitzen, Becket (America)
  • Martensitic: Brearley (England)
  • Martensitic: Brearley (England)

Stabilized stainless steel Precipitation hardening stainless steel

05Passivity layer structure
Type General carbon steel Stainless steel
Shape Fe-oxide layers Cr203 layers
Characteristics Thick and porous layer; easier for external oxygen to penetrate Thin and dense layer; easier for external oxygen to penetrate