Shenzhen Tec-Key Technology Co., Ltd. 86-755-89372016 jd@tec-key.com
304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill

304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill

  • High Light

    Buckle Furniture Metal Parts

    ,

    Aviation Thickened Furniture Metal Parts

    ,

    CNC metal spring buckles

  • Material
    Stainless Steel, SECC, Carbon Steel, SPTE
  • Finished
    Sandblasting Anodic Oxidation
  • Color
    Silver/red/black/colorful
  • Process
    Cnc Machining, Turning CNC Parts, CNC Milling, Turning, According To The Workpiece And Precision
  • Surface Treatment
    Powder Coating
  • Size
    Customer's Requst
  • Place of Origin
    China Shenzhen
  • Brand Name
    Tec-Key
  • Certification
    ISO9001:2015
  • Model Number
    654231
  • Minimum Order Quantity
    100 pcs
  • Price
    USD0.5-30 pcs
  • Packaging Details
    32*23*17cm
  • Delivery Time
    5-8 work days
  • Payment Terms
    T/T
  • Supply Ability
    10000 pcs days

304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill

304 stainless steel spring buckle aviation thickened duck bill buckle box buckle
 
Grade 304 is the standard “18/8” austenitic stainless; it is the most versatile and most widely used stainless steel, available in the widest range of products, forms and finishes. It has excellent forming and welding characteristics.
 
Grade 304L, the low carbon version of 304, does not require post-weld annealing and so is extensively used in heavy gauge components (about 5mm and over). Grade 304H with its higher carbon content finds application at elevated temperatures. The austenitic structure also gives these grades excellent toughness, even down to cryogenic temperatures.
 
Grade 304 can be severely deep drawn without intermediate annealing, which has made this grade dominant in the manufacture of drawn stainless parts such as sinks, hollow-ware and saucepans. For severe applications it is common to use special “304DDQ” (Deep Drawing Quality) variants.
 
Corrosion Resistance
Very good in a wide range of atmospheric environments and many corrosive media. Subject to pitting and crevice corrosion in warm chloride environments, and to stress corrosion cracking above about 60°C. Considered resistant to pitting corrosion in potable water with up to about 200mg/L chlorides at ambient temperatures, reducing to about 150mg/L at 60°C. Consult Atlas Technical Assistance for specific environmental recommendations.
 
There is usually no difference in corrosion resistance between 304 and 304L.
 
Heat Treatment
Solution Treatment (Annealing) Heat to 1010-1120°C and cool rapidly. These grades cannot be hardened by thermal treatment.
 
Heat Resistance
Good oxidation resistance in intermittent service to 870°C and in continuous service to 925°C. Continuous use of 304 in the 425- 860°C range is not recommended if subsequent aqueous corrosion resistance is important. Grade 304L is resistant to carbide precipitation and can be heated into this temperature range.
 
Grade 304H has higher strength at elevated temperatures so is often used for structuraland pressure-containing applications at temperatures above about 500°C and up to about 800°C. 304H will become sensitised in the temperature range of 425-860°C; this is not a problem for high temperature applications, but will result in reduced aqueous corrosion resistance.
 
 
 
Machining
A “Ugima” improved machinability version of grade 304 is available in bar products. “Ugima” machines significantly better than standard 304, giving higher machining rates and lower tool wear in many operations.
 
Welding
Excellent weldability by all standard fusion methods, both with and without filler metals. AS 1554.6 pre-qualifies welding of 304 with 308, and 304L with 308L rods or electrodes (or their high silicon equivalents). Heavy welded sections in Grade 304 may require post-weld annealing for maximum corrosion resistance. This is not required for Grade 304L. Grade 321 may also be used as an alternative to 304 if heavy section welding is required and post- weld heat treatment is not possible.
 
“Dual Certification”
It is common for 304 and 304L to be stocked in “Dual Certified” form, particularly in plate, pipe and round bar. These items have chemical and mechanical properties complying with both 304 and 304L specifications. Such dual certified product may be unacceptable for high temperature applications.
 
Typical Applications
Food processing, transport and storage equipment, particularly in beer brewing, milk processing and wine making. Kitchen benches, sinks, troughs, equipment and appliances. Architectural panelling, railings & trim. Chemical containers, including for transport. Heat Exchangers. Woven or welded screens. Threaded fasteners. Springs.
 
Specified Properties
These properties are specified for flat rolled product (plate, sheet and coil) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as pipe and bar in their respective specifications. Minor changes to 304 and 304L composition limits were made in 2006-7 to harmonise with similar grades specified in ISO and European standards.
 
Mechanical Property Specification (single values are minima except as noted)
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

304 515 205 40 92 201
304L 485 170 40 92 201
304H 515 205 40 92 201
304H also has a requirement for a grain size of ASTM No 7 or coarser.
Composition Specification (%)
Grade C Mn Si P S Cr Mo Ni N
304 min. max. - 0.07

-

2.0

- 0.75 - 0.045 - 0.030

17.5

19.5

-

8.0

10.5

- 0.10
304L min. max. - 0.030

-

2.0

- 0.75 - 0.045 - 0.030

17.5

19.5

-

8.0

12.0

- 0.10
304H min. max.

0.04

0.10

-

2.0

- 0.75 - 0.045 - 0.030

18.0

20.0

-

8.0

10.5

-
Grade Specification Comparison
Grade

UNS

No

Euronorm Swedish SS Japanese JIS
No Name
304 S30400 1.4301 X5CrNi18-10 2332 SUS 304
304L S30403 1.4307 X2CrNi18-9 2352 SUS 304L
304H S30409 1.4948 X6CrNi18-11 - -
These comparisons are approximate only. The list is intended as a comparison of functionally similar materials not as a schedule of contractual equivalents. If exact equivalents are needed original specifications must be consulted.
Physical Properties(typical values in the annealed condition)
Grade Density (kg/m3)

Elastic Modulus

(GPa)

Mean Coefficient of Thermal Expansion Thermal Conductivity

Specific Heat

0-100°C

( J/kg.K)

Electrical Resistivity

(n.m)

0-100°C

(m/m/°C)

0-315°C

(m/m/°C)

0-538°C

(m/m/°C)

at 100°C (W/m.K) at 500°C (W/m.K)
304/L/H 7900 193 17.2 17.8 18.4 16.3 21.5 500 720

 

Possible Alternative Grades

Grade Why it might be chosen instead of 304
301/L A higher work hardening rate grade is required for roll formed or stretch formed components.
F20S Lower cost needed in thin gauge sheet and coil. Durinox F20S also has easier fabrication.
303 Higher machinability needed; lower corrosion resistance, formability & weldability are acceptable
316 Higher resistance to pitting and crevice corrosion is required, in chloride environments
253MA Better resistance high temperatures is needed. 253MA is optimised for temperatures to 1150°C.
430 A lower cost is required, and the reduced corrosion resistance and fabrication characteristics are acceptable.
304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill 0304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill 1304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill 2304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill 3304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill 4304 Stainless Steel Furniture Metal Parts Spring Buckle Aviation Thickened Duck Bill 5