3Cr12 Stainless Steel Plate

Jual stainless steel 3Cr12 plate &sheet dengan berbagai ukuran& ketebalan.

Description

3CR12, a registered trade mark of Stainless steel product, is a weldable chromium containing utility stainless steel, with a fine grained duplex ferritic-martensitic microstructure.

Stainless steel 3CR12 is a proprietary modification of Grade 409 chromium stainless steel. It has been developed as a readily fabricated, low cost grade, exhibiting good resistance to wet abrasion and mildly corrosive environments. National specifications cover this grade by designations 1.4003 and UNS S40977 / S41003.

Proprietary 3CR12 conforms to EN 10088.2 grade 1.4003, ASTM A240/ A240M grades UNS S40977 and S41003 and ASME SA240 grades UNS S40977 and S41003. 1.4003 is also included in EN 10028.7 covering stainless steels for pressure purposes.

Properties

Like other chromium stainless steel, 3CR12 has useful strength at temperature about 600oC. This ele vated temperature strength is significantly higher than that of plain-carbon steels. Hot working can be carried out at 700ºC – 800ºC without significantly affecting subsequent mechanical properties. Above 850ºC, 3CR12 behaves superplastically due to the fine grained duplex microstructure.

Chemical Composition

C Si Mn P S Ni Cr Ti N
0.03 Max 0.1 Max 0.15 Max 0.40 Max 0.03 Max 1.5 Max 10.5 – 13.0 0.06 Max 0.03 max

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Properties Thickness Specification
0,2% Proof Stress < 3mm
≥ 3mm
280 MPa (Min)
300 MPa (Min)
Tensile Strength 460 MPa
Elongation in 50mm G.L ≤ 4.5mm
> 4.5mm
18% (Min)
20% (Min)
Charpy Impact V 20ºC
Hardness < 12mm
≥ 12mm
220 HB
250 HB

Possible Alternative Grades

Possible alternative grades to grade 3CR12 stainless steels are given in table.

Grade

Why it might be chosen instead of 3CR12

304

Better corrosion resistance and fabrication properties are required.

430

Better corrosion resistance and appearance is required. Weldability not needed.

Galvanised steel

A lower cost is required, and the reduced corrosion resistance and
fabrication characteristics of galvanised steel are acceptable.

Weathering steel

A lower cost is required, and the reduced corrosion resistance and
fabrication characteristics of weathering steel are acceptable.

Corrosion Resistance

3CR12 is effective in many applications where carbon steel, galvanised, aluminised or painted steel or aluminium give unsatisfactory life. It is not attacked by strong alkalies, and often gives adequate resistance in acidic conditions.

3CR12 strongly resists chloride stress corrosion cracking, but is less resistant than 304 to pitting and crevice corrosion in chloride environments. 3CR12 is likely to resist water with chloride contents of up to 150 to 200 mg/L at ambient temperatures. The presence of sulphate or nitrate ions will reduce the corrosivity of chlorides. Light surface rust can form in many atmospheres, making the material unsuitable for decorative applications.

Heat Resistance

In air 3CR12 offers scaling resistance to 600°C continuous or 750°C intermittent, but if under stress the temperature should be limited to 450°C continuous or 600°C intermittent. 3CR12 suffers negligible embrittlement after extended exposure at temperatures of 450-550°C; it can be used safely at these temperatures without loss of room temperature impact resistance.

Heat Treatment

Annealing – heat to 700-750°C, soak for 1½ hours per 25mm section. Air cool. The maximum temperature of 750°C should not be exceeded. Annealing should usually be followed by pickling and passivating.

This grade should not be hardened by heat treatment; quenching treatments may reduce the corrosion resistance and mechanical properties.

Welding

3CR12 can be readily welded using similar techniques to austenitic stainless steels. Low heat input processes are preferred – particularly GTAW (TIG) and GMAW (MIG). Filler wire pre-qualified by AS 1554.6 (3CR12 referred to as “4003”) is grade 309, but 309L, 309Mo, 316L and 308L have been successfully used. Argon plus 1-2% oxygen shielding gases are recommended. Discolouration of the weld should be removed by pickling, except possibly in wear applications; effective purging and use of backing gases is often a better option.

Machining

3CR12 has a machinability similar to that of grade 430, ie about 60% of that of mild steel. The work hardening rate is lower than that of austenitic stainless steels, so reducing the need for special machining techniques.

Finishes

3CR12 is available in standard HRAP (Hot Rolled Annealed and Pickled) finish in plate, and 2B or 2D in coil. “Black” finish is also produced; this is hot rolled and with the high temperature scale left on the steel. The resulting dark oxidised surface has good low friction characteristics and a corrosion resistance that is useful for many wear applications, even although slightly less resistant than the “white” pickled finish.

Application

3CR12 is a particularly recommended for use on moderately aggressive environments found in the construction, industrial, marine, mining and mineral
processing fields. It provides a cost effective solution to corrosion, oxidation and corrosion/abrasion problems in a wide range of environments. Typical examples include:

• Ore Cars
• Pipe & Tube for Slurry Handling
• Coal Chutes and Liners
• Storage Bins and Hoppers
• Locomotive Bodies
• Ash Handling
• Masonry Fixings
• Coal Wash Plant Structure
• Conveyor Decking
• Sand – Chutes Dredging
• Screw Conveyors

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