SUS 410 self-tapping screw of solar mounting system
SUS 410 self-tapping screw
Type 410 is hardenable, straight-chromium stainless steels which combine superior wear resistance of high carbon alloys with the excellent corrosion resistance of chromium stainless steels. Oil quenching these alloys from temperatures between 1800°F to 1950°F (982-1066°C) produces the highest strength and/or wear resistance as well as corrosion resistance. Type 410 alloy is used where strength, hardness, and/or wear resistance must be combined with corrosion resistance.
C Carbon – 0.15%
Mn Manganese – 1.00%
P Silicon – 1.00%
S Chromium – 11.50 – 13.50%
Si Nickel – 0.75%
Cr Sulfur – 0.03%
Ni Phosphorous – 0.04%
Percent by weight, maximum unless a range is listed.
Strength of SUS 410
The physical properties of grade 410 stainless steels in the annealed condition are tabulated below
Grade 410 stainless steels are resistant to hot gases, steam, food, mild acids and alkalies, fresh water and dry air. These steels obtain maximum corrosion and heat resistance through hardening. However, grade 410 steels are less corrosion resistant than austenitic grades and grade 430 ferritic alloys containing 17% chromium. Smooth surface finish offers improved performance of steels.
Grade 410 steels have good scaling resistance at temperatures of up to 650 °C. However, the mechanical properties of the material will tend to reduce at temperatures ranging from 400 to 580 °C.
Annealing – Grade 410 steels can be fully annealed at temperatures from 815 to 900 °C, followed by slow furnace cooling and air-cooling. Process annealing of grade 410 steels can be carried out at temperatures ranging from 650 to 760 °C and air-cooled.
Hardening – Hardening of grade 410 steels can be performed at 925 to 1010 °C, followed by air and oil quenching. Heavy sections of grade 410 need to be oil quenched. Tempering, to enhance the mechanical properties and hardness of grade 410 steels, follows this process. It is not recommended to perform tempering at temperatures from 400 to 580 °C.
Grade 410 steels can be welded using all conventional welding techniques, but the materials should pre-heated at 150 to 260 °C followed by post-weld annealing treatment, to mitigate cracking. Grade 410 welding rods are recommended for tempering and post-hardening. In the “as welded” conditions, grade 309 filler rods can be used to achieve a ductile joint.
According to AS 1554.6 standards, grade 309 electrodes or rods are preferred for welding 410 steels.
Grade 410 steels can be easily machined in highly tempered or annealed conditions. However, it is hard to machine grade 410 steels if they are hardened above 30HRC. Free machining grade 416 is the best alternative.
Grade 410 stainless steels find applications in the following:
- Bolts, screws, bushings and nuts
- Petroleum fractionating structures
- Shafts, pumps and valves
- Mine ladder rungs
- Gas turbines
As above properties, SUS 410 self-drilling screw are used in solar mounting system industry as it can have a anti-corrosion and strength balance, also cost concern, most cases the screw need to penetrate into steel substructures.