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Stainless steel grade 430 is a non-hardenable steel containing straight chromium, belonging to the ferritic group of steels. Known for its good corrosion resistance and formability, coupled with practical mechanical properties, it can be used in certain chemical applications.
Grade 430F stainless steel is typically provided in bar form for use in automatic screw machines. Grade 434 has similar properties to grade 430, although it is a molybdenum-bearing version that enhances corrosion resistance.
Chemical Composition
Table 1 - Chemical compositions of grade 430 stainless steels
Grade
C
Mn
Si
P
S
Cr
Mo
Ni
N
430
- 0.12
- 1
- 1
- 0.04
- 0.030
16 - 18
-
- 0.50
-
430F
- 0.12
- 1.25
- 1
- 0.06
0.15 -
16 - 18
-
-
-
Mechanical Properties
Table 2 - Mechanical properties of grade 430 stainless steels
Grade
Tensile Strength (MPa) min
Yield Strength 0.2% Proof (MPa) min
Elongation (% in 50mm) min
Rockwell B (HR B) max
Brinell (HB) max
430
483
310
22
85
183
430F
552 typical
379 typical
25 typical
-
262
Physical Properties
Table 3 - Physical properties of grade 430 stainless steels in the annealed condition
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)
430
7750
200
10.4 (0-100°C) 11.0 (0-315°C) 11.4 (0-538°C)
26.1 (at 100°C) 26.3 (at 500°C)
460
600
430F
7750
200
10.4 (0-100°C) 11.0 (0-315°C) 11.4 (0-538°C)
26.1 (at 100°C) 26.3 (at 500°C)
460
600
Grade Specification Comparison
Table 4 - Grade specifications for 430 stainless steels
Grade
UNS No
Old British
Euronorm
Swedish SS
Japanese JIS
430
S43000
430S17
1.4016
2320
SUS 430
430F
S43020
-
1.4104
2383
SUS 430F
Possible Alternative Grades
Table 5 - Possible alternatives to grade 430 stainless steel
Grade
Reasons for choosing alternative
430F
Higher machinability than 430 is needed in bar product, and reduced corrosion resistance is acceptable
434
Better pitting resistance is required
304
Slightly higher corrosion resistance is needed, together with greatly improved ability to be welded and cold formed
316
Much better corrosion resistance is needed, coupled with greatly improved ability to be welded and cold formed
3CR12
Lower corrosion resistance is acceptable in a cost-critical application
Corrosion Resistance
All ferritic grades, including stainless steel grade 430, have excellent stress corrosion cracking resistance. Grade 430 demonstrates good corrosion resistance to numerous substances, with maximum corrosion resistance achieved in well-polished or buffed condition. Its pitting and crevice corrosion resistance is comparable to grade 304. 430F, being a high-sulfur free machining grade, has comparatively lower resistance to pitting and crevice corrosion than non-free machining grades.
Heat Resistance
Stainless steel grade 430 is capable of resisting oxidation up to 870°C (1598°F) in intermittent usage, and up to 815°C (1499°F) in continuous usage. At room temperature, it may become brittle, particularly when heated for extended periods in the 400-600°C (752-1112°F) range. This issue can be mitigated through annealing.
Heat Treatment
Solution annealing can be performed by heating stainless steel grade 430 to 815-845°C (1499-1553°F), followed by slow furnace cooling to 600°C (1112°F) and rapid air-cooling. Slow cooling between 540 and 400°C (1004 and 752°F) may cause embrittlement.
For sub-critical annealing, heating should be performed to 760-815°C (1400-1499°F), followed by air-cooling or water quenching. This stainless steel cannot be hardened by thermal treatment.
Welding
For welding applications, stainless steel grade 430 should be pre-heated at 150-200°C (302-392°F). If embrittlement occurs in the welded metal, the affected area can be post-weld annealed at 790-815°C (1454-1499°F), though grain refinement will not occur.
Recommended filler rods include grade 430, 308L, 309, or 310, depending on the specific application requirements.
Machining
The machinability of stainless steel grade 430 is significantly easier than standard austenitic steels such as grade 304, though galling may occur. Lightly drawn bars are easier to machine than bars in the annealed condition. Grade 430F offers excellent machinability.
Fabrication
Stainless steel grade 430 has a low work hardening rate that facilitates easy bending and forming. However, its low ductility rate makes rigorous operations more challenging. Grade 430 wire can handle rigorous cold heading, though sub-critical intermediate annealing may be required for extreme cold working applications.
Applications
Dish washer linings
Refrigerator cabinet panels
Element supports and fasteners
Stove trim rings and chimney liners
Automotive trim and lashing wires
Product Images
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2012
Total Annual:
500,000,000-800,000,000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h... Company Overview ：
The company has an indoor warehouse of 5000 square meters and an open warehouse of 4000 square meters, which can fully meet the temporary turnover and phased storage of customers' steel pipe reservation.
The subordinate processing plant has 6 sets of medium frequency h...
