JIS G4305 SUS430LX Steel Plate | 430LX Stainless Steel

As a stainless steel supplier and China mill-direct exporter, SHH STEEL supplies JIS G4305 SUS430LX Steel Plate, also known as 430LX stainless steel. SUS430LX is a stabilised low-carbon ferritic grade of JIS G4305:2021, the Japanese Industrial Standard for cold-rolled stainless steel plate, sheet and strip. It is a 16.00 – 19.00 % chromium steel with carbon limited to 0.030 % and stabilised with titanium or niobium (0.10 – 1.00 %), which improves weldability and formability compared with SUS430.

GB/T 20878 cross-references SUS430LX to the Chinese grade GB/T 4237 022Cr17NbTi S11763 plate, to ISO X2CrTi17 and to EN 1.4520, supplied as EN 10088-2 1.4520 plate. In the JSSA classification, SUS430J1L, SUS436L and SUS443J1 are rated above SUS430LX for corrosion resistance.

This page summarises the requirements of JIS G4305:2021 for SUS430LX: chemical composition, mechanical properties, surface finishes, standard sizes and the informative heat-treatment conditions of Annex JA. Hot-rolled plate of the same grade is ordered to JIS G 4304:2021, which also lists SUS430LX. SHH STEEL quotes either standard and confirms the edition named on the drawing before an order is placed.

Mechanical properties in JIS G4305 apply to thickness 0.30 mm and above, and the standard notes that properties after heat treatment carried out by the user are not specified. Clause 7 makes intergranular corrosion testing a matter for agreement.

Titanium or niobium ties up carbon and nitrogen, which limits chromium carbide formation in the heat-affected zone of welds. Nickel is limited to 0.60 %.

SUS430 in the same table requires 205 N/mm² proof stress and 420 N/mm² tensile strength, so SUS430LX is softer, which helps deep drawing and forming.

JIS G4305 leaves polished finishes such as No.3, No.4, #240, #320 and #400 to the manufacturer’s method, so SHH STEEL writes the finish, the grit and any protective film into the purchase order. For ferritic sheet, No.2B, BA and HL are common; BA and HL are used for appliance and building surfaces.

Annex JA is informative. Ferritic grades are annealed rather than solution treated, and they do not harden on quenching, so either rapid or slow cooling is allowed where the annex says so.

Table 19 of JIS G4305 gives a basic mass of 7.70 kg/(mm·m²) for SUS430LX, which is used to calculate plate weight (equivalent to a density of 7.70 g/cm³). Lead time from the mill is normally 30 – 40 days after order confirmation, depending on size, finish and rolling schedule.

• Chromium 16 – 19 % with titanium or niobium stabilisation.
• Low carbon (≤ 0.030 %) for better weldability than SUS430.
• Proof stress ≥ 175 N/mm², tensile strength ≥ 360 N/mm², elongation ≥ 22 %.
• Nickel-free in practice (≤ 0.60 %), so price depends less on nickel.
• Magnetic in all conditions.
• Density 7.70 g/cm³ (JIS G4305 Table 19).

For pressure equipment, see EN 10028-7 1.4520 pressure vessel plate. Within JIS G4305, JIS G4305 SUS430 steel plate is the unstabilised grade and JIS G4305 SUS436L steel plate adds molybdenum.

Euro Inox lists domestic appliances, especially washing machine drums, as typical applications for the EN equivalent 1.4520, with good resistance to water and water vapour, weak acids and alkaline solutions. Typical uses include:

• Washing machine drums and other domestic appliance parts
• Formed and welded parts where SUS430 welds would be a concern
• Parts exposed to water and water vapour

For better pitting resistance, JIS G4305 SUS444 steel plate is the molybdenum-bearing step up.

The table compares SUS430LX with the JIS G4305:2021 grades that buyers most often consider alongside it. Chemistry is taken from Tables 3 – 7 and the minimum mechanical properties from Tables 8 – 14 of the standard, all in the condition in which the grade is normally supplied.

SUS430LX is softer than SUS430 and stabilised for welding. JSSA rates SUS430J1L, SUS436L and SUS443J1 above SUS430LX for corrosion resistance; SUS444 adds 1.75 – 2.50 % molybdenum. SHH STEEL can quote the grades in this table side by side when a buyer is still choosing between them.

SUS430LX is listed in both JIS G4305:2021 (cold-rolled plate, sheet and strip) and JIS G4304:2021 (hot-rolled plate, sheet and strip). The chemistry and the mechanical property tables are the same in both standards, but the product range, finish and tolerances differ:

As a rule, thin sheet and anything that needs a bright or brushed surface is ordered to JIS G4305, while heavier plate for fabrication is ordered to JIS G4304. Sizes outside the tables are possible by agreement in both standards. SHH STEEL confirms which standard and finish suit the part before quoting.

A common way to rank resistance to pitting is the pitting resistance equivalent number, PREN = %Cr + 3.3 × %Mo + 16 × %N. Calculated from the JIS G4305 limits, SUS430LX has a PREN of about 16.0 at the minimum of every range and about 19.0 at the maximum. PREN is a ranking tool, not a guarantee of performance in a given environment, and actual heats normally sit between these values; the certificate analysis gives the real figure for each heat. SHH STEEL can calculate the PREN of the heat offered from its certificate before the order is confirmed.

SUS430LX has corrosion resistance of the 17 % chromium class. Euro Inox describes the EN equivalent 1.4520 as having good resistance to water and water vapour, weak acids and alkaline solutions. Stabilisation with titanium or niobium protects the heat-affected zone of welds against intergranular attack. Ferritic grades are generally less prone to chloride stress corrosion cracking than the 300-series austenitic grades.

Where resistance to intergranular corrosion must be demonstrated, clause 7 of JIS G4305 lets the purchaser specify one of four test methods: JIS G 0571 (oxalic acid etch test), JIS G 0572 (ferric sulphate – sulphuric acid test), JIS G 0573 (65 % nitric acid test) or JIS G 0575 (copper sulphate – sulphuric acid test). One test piece is taken per heat and heat-treatment lot. SHH STEEL writes the chosen method and acceptance criterion into the mill order when a project requires it.

JIS G4305 gives physical data only as the basic mass of 7.70 kg/(mm·m²) in Table 19. The other values are typical figures published for EN 1.4520 (Euro Inox) and are given for design guidance only; they are not acceptance requirements for SUS430LX. Ferritic steel has a lower thermal expansion and higher thermal conductivity than austenitic steel. On request, SHH STEEL can pass on the producing mill’s own data sheet for the heat supplied.

SUS430LX is a ferritic steel. Ferritic grades are welded with lower heat input than austenitic grades, because grain growth in the heat-affected zone can reduce toughness and ductility; stabilised and low-interstitial grades are designed to limit this effect. Thin sheet is commonly joined by TIG, plasma, resistance or laser welding. Ferritic steels have lower thermal expansion than austenitic steels, so they distort less during welding and in thermal cycling.

In forming, ferritic sheet has lower work hardening than austenitic sheet and is often chosen for deep-drawn appliance parts; its bend requirement in JIS G4305 Table 11 is checked by the mill. For the EN equivalent 1.4520, Euro Inox lists 1.4316 and 1.4502 filler materials.

SHH STEEL can deliver SUS430LX cut to size, bevelled or pre-formed through its processing partners, so that the fabricator receives parts ready for welding.

JIS G4305:2021 clause 9 sets the tolerances for cold-rolled plate, sheet and strip, and SHH STEEL checks thickness at the positions the standard defines before shipment. Thickness tolerances for plate are given in Table 20 and depend on thickness and width:

Tighter thickness tolerances can be ordered with the symbols ET (Table 22) or ST (Table 23), and narrower width tolerances with EW (Table 26). Plate width tolerance (Table 24) is +10 / 0 mm for lengths up to 3 500 mm, and plate length tolerance (Table 27) is +10 / 0 mm for thickness under 10 mm and lengths up to 3 500 mm. Flatness is measured on request: Table 28 allows 15 – 20 mm per 3 500 mm length, or 3 – 6 mm when the special flatness symbol EF is ordered.

For hot-rolled SUS430LX plate ordered to JIS G 4304, the tolerances of that standard apply. SHH STEEL states the tolerance symbols on the quotation so that the buyer knows exactly which table the plate will be measured against.

Clause 11 of JIS G4305 sets the test rules. Chemical analysis follows JIS G 0404 and JIS G 0320, and a product (check) analysis to JIS G 0321 can be requested by the purchaser. For mechanical tests, one sample is taken from plate or strip of the same heat and the same heat-treatment condition, and one test piece is used for each test.

• Tensile test to JIS Z 2241 at 23 ± 5 °C, using test piece No. 4, No. 10 or No. 13B (No. 14A, 14B or 5 also allowed).
• Hardness test to JIS Z 2243-1 (Brinell), JIS Z 2244-1 (Vickers) or JIS Z 2245 (Rockwell), at 23 ± 5 °C.
• Bend test to JIS Z 2248 where the grade has a bend requirement; the manufacturer may omit it, but the material must still meet it, and it must be done if the purchaser asks.
• Inspection of chemistry, mechanical properties, surface finish, dimensions and appearance under clause 12; corrosion resistance only when specified.

Under clause 13 each plate or bundle is marked with the grade symbol, dimensions, any special tolerance or flatness symbols (ET, ST, EW, EF), the surface finish, the heat-treatment symbol where applicable, the manufacturer’s name or mark, and the heat or inspection number. Clause 14 makes the inspection document JIS G 0415 type 3.1 unless another type is ordered; SHH STEEL checks the marking against the certificate before shipment, and a third-party inspector arranged by SHH STEEL can witness the tests when a 3.2 document is required.

A complete enquiry avoids delays and wrong deliveries. For SUS430LX we recommend stating:

• Standard and edition: JIS G 4305:2021 (cold rolled) or JIS G 4304:2021 (hot rolled), grade SUS430LX.
• Product form: plate, sheet, coil or strip; thickness, width and length, or coil inner diameter and weight.
• Tolerance and flatness symbols if tighter than standard (ET, ST, EW, EF).
• Surface finish from Table 15 (No.2D, No.2B, BA, HL) or a polished finish with grit and protective film.
• Heat-treatment condition, and any intergranular corrosion test method (JIS G 0571 – 0575).
• Inspection document type (JIS G 0415 3.1 by default, 3.2 if third-party witness is needed).
• Any dual certification required, for example to ASTM A240 or EN 10088-2, and any product analysis or PMI.
• Packing, marking and destination port; SHH STEEL can add customer marking or bar codes on request.

SHH STEEL reviews every enquiry against these points and confirms in writing anything that the mill cannot meet before the order is placed.

Table 18 of JIS G4305 calculates plate mass from the basic mass in Table 19, which for SUS430LX is 7.70 kg per mm of thickness per m² of area. The basic mass is multiplied by the thickness in millimetres to give the unit mass in kg/m², then by the plate area in m², and the result is rounded as the table specifies.

Invoiced weight may be calculated (theoretical) or actual (weighed), and this should be agreed at the order. SHH STEEL states which method is used on the quotation, and the SHH STEEL packing list shows both the calculated and the actual weight of each bundle.

As a SUS430LX supplier, we find that buyers usually worry less about price than about getting the right material on time. The table below lists the concerns we hear most often and how SHH STEEL deals with each one.

SHH STEEL also offers steel cutting services, bending and forming services, a third-party testing service with partner laboratories, and a worldwide shipping service. See our full range of stainless steel sheets and plates.

JIS G4305 SUS430LX Steel Plate (430LX stainless steel) is the stabilised low-carbon 17 % chromium ferritic grade of JIS G4305, chosen over SUS430 for welded and formed parts. SHH STEEL supplies it with full JIS G4305 compliance, 3.1 inspection certificates and optional third-party testing, with a normal lead time of 30 – 40 days. Contact SHH STEEL for availability, sizes and a quotation for your SUS430LX requirement.