430 Stainless Steel Sheet - Wuxi Alter (Wuxi Branch,Jiangsu Province

Type 430 is a commonly used stainless steel with good corrosion resistance. It features better thermal conductivity than Austenite with smaller thermal expansion coefficient. In addition, it embodies good heat fatigue resistance and stress corrosion resistance. It is a typical non-heat treated hardenable ferritic stainless steel. Since titanium is added as the stabilizing element, the welds of the steel has good mechanical properties. Also, it is becoming a replacement for 304 stainless steel in many applications for its lower price.

Grade 430 has good corrosion resistance in oxidizing acid solutions, especially in nitric acid, it is therefore widely used in the manufacture of chemical equipment for the production of nitric acid, such as absorption towers, nitric acid heat exchangers, acid tanks, transfer pipes and tanks. Because it is safety and non-toxic, it is widely used in the production of food, wine and other industrial pipes and tableware.

Composition

The chemical compositions of various elements of grade 430 stainless steels are tabulated below.

Table 1 – Chemical compositions of grade 430 stainless steels

Mechanical Properties

The mechanical properties for grade 430 stainless steels are listed in the table below.

Table 2 - Mechanical properties of grade 430 stainless steels

Physical Properties

The following table outlines the physical properties of grade 430

Table 3 - Physical properties of grade 430 stainless steels in the

Grade Specification Comparison

A comparison of grade specifications for 430 stainless steels is given in the following table.

Table 4 - Grade specifications for 430 stainless steels

Possible Alternative Grades

Suitable alternative grades that can be chosen instead of grade 430 stainless steelgrades that can be chosen instead of grade 430 stainless steel are listed in the table below.

Table 5 - Possible alternatives to grade 430 stainless steel

Corrosion Resistance

All ferritic grades, such as stainless steel grade 430, have excellent stress corrosion cracking resistance. Grade 430 has good corrosion resistance to numerous substances, such as certain organic acids and nitric acid. The corrosion resistance is maximized in well-polished or buffed condition. Its pitting and crevice corrosion resistance is quite similar to that of grade 304. 430F is a high-sulfur free machining grade, and therefore the resistance to pitting and crevice corrosion is comparatively lesser than those grades that are non-free machining.

Heat Resistance

Solution annealing can be performed by heating stainless steel grade 430 to 815 - 845°C (1499-1553°F). Then it has to be slow furnace cooled to 600°C (1112°F) and followed by air-cooling in a quick manner - as slow cooling between 540 and 400°C (1004 and 752°F) tends to 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.

Fabrication

Stainless steel grade 430 has a low work hardening rate which enables easy bending and forming. The low ductility rate, however, makes it difficult to perform very rigorous operations. It is possible for grade 430 wire to handle rigorous cold heading. Sub-critical intermediate annealing may be required for extreme cold working.