409L SS Sheet / 409L Stainless Steel Plate ASTM A240 Standard
Thickness 0.4 - 3.0mm
Products Specification
| Products Name | 409L Stainless Steel Sheet |
| Standard | ASTM EN JIS GB BIS |
| Thickness | 0.4mm 0.5mm 0.6mm 0.8mm 1.0mm 1.2mm 1.5mm 2.0mm 2.5mm 3.0mm |
| Surface | 2B 2D or process other surface as request |
| Standard Size | 1219*2438mm 1000*2000mm |
| Service | Slit Cutting, bending , surface treatment |
| Other Grade | 200 Series: 201 202 |
| 300 Series: 301 304 304L 309S 310S 316L 316Ti 317l 321 329 347 |
| 400 Series: 409L 410S 416 420 431 436L 439 441 443 444 446 |
| Special Grade: 254SMO 904L 2205 2507 253MA Nickel Alloy |
| MOQ | 500 kgs |
| Packing | Wooden Pallets and waterproof paper |
Introduction
Grade 409 stainless steel is a Ferritic steel that offers good
mechanical properties and high-temperature corrosion resistance. It
is commonly considered as a chromium stainless steel, with
applications in exhaust systems of automobiles and applications
that demand weldability.
Grade 409 steels are also available in highly stabilized forms,
such as grades S40930, S40920 and S40910. The stability of these
grades is provided by the presence of niobium, titanium, or both,
in the composition of steels.
Key Properties
The properties given below relate to annealed tubing of ASTM A268.
The specified properties may not be similar to other products such
as bar and coil.
Composition
The typical chemical compositional ranges of grade 409 stainless
steels are given below:
Table 1 - Composition ranges of grade 409 stainless steels
| Grade | C | Mn | Si | P | S | Cr | Ni | Ti |
| 409 | min. max. | - 0.08 | - 1.00 | - 1.00 | - 0.045 | - 0.045 | 10.5 11.75 | - 0.5 | 6x C 0.75 |
Mechanical Properties
The table below provides the mechanical properties of grade 409
stainless steels:
Table 2 - Mechanical properties of grade 409 stainless steels
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness |
| Rockwell B (HR B) max | Brinell (HB) max |
| 409 | 450 | 240 | 25 | 75 | 131 |
Physical Properties
The physical properties of annealed grade 409 stainless steels are
tabulated below:
Table 3 - Physical properties of annealed grade 409 stainless
steels
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (μm/m/°C) | Thermal Conductivity (W/m.K) | Specific Heat 0-100°C (J/kg.K) | Electrical Resistivity (nΩ.m) |
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C |
| 409 | 7800 | 200 | 11.0 | 11.7 | 12.4 | 25.8 | 27.5 | 460 | 600 |
Grade Specification Comparison
Table 4 provides approximate grade comparisons of 409 stainless
steels:
Table 4 - Grade specifications for 409 grade stainless steel
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 409 | S40900 | 409S19 | - | 1.4512 | X6CrTi12 | - | SUH 409 |
Heat Resistance
Grade 409 stainless steels offer scaling resistance at temperatures
up to 675°C during continuous operation, and up to 815°C under
intermittent conditions. These temperatures pertain to specific
service environments.
Heat Treatment
Annealing of grade 409 steels is carried out at temperatures
ranging from 790 to 900°C, followed by air-cooling. Thermal
treatment does not harden grade 409 steels.
Welding
Grade 409 steels must be pre-heated to temperatures of 150 to 260°C
before welding. Although grade 430 and 409 filler rods or
electrodes can be used during welding of grade 409 steels, grade
309 electrodes or filler rods are strongly recommended by AS
1554.6. Care should be taken to weld grade 409 steels with minimum
heat, in order to mitigate grain growth.
Ductility of the welded products can be improved by annealing
post-welding at temperatures of 760 to 815°C. However, this is not
required for thin welded products. Welding of exhaust tubing of
automobiles is carried out without filler rods.
Applications
The typical applications of grade 409 stainless steels are listed
below:
- Automotive exhaust tubing
- Catalytic converter systems
- Mufflers
