When selecting stainless steel for engineering, marine, chemical, or structural applications, the decision between 2205 duplex stainless steel and 316 stainless steel is critical. Both materials are widely used, but they differ significantly in strength, corrosion resistance, cost efficiency, and fabrication behavior.

For commercial kitchen equipment manufacturers in Krasnodar, ordering 304 and 430 stainless steel sheet starts with the individual parts. A sink bowl, preparation worktop, removable cover and extraction hood can belong to one equipment package while needing different material specifications.

304 is a common starting point for sinks and frequently wet preparation surfaces. 430 can be appropriate for selected covers, frame cladding and other components in mild service. The purchasing task is to assign a grade to each part, confirm fabrication requirements and keep the materials identifiable through production.

This guide explains how to build that mixed-grade bill of materials, or BOM, for a workshop supplying commercial kitchens, washing stations and preparation equipment in Krasnodar Krai.

1. Assign 304 or 430 to Each Kitchen Component

The following matrix is a selection starting point. Final approval should consider food residues, water quality, cleaning chemicals, temperature, drainage and the equipment drawing.

For example, an approved washing-station design might combine a 304 bowl and drainboard with removable 430 side covers that stay dry. A rear panel exposed to leaking connections or trapped condensation should be assessed separately.

Neither grade is corrosion-proof. Persistent brine, aggressive cleaners or poorly drained crevices may require a different material or a change in equipment design. Food-contact suitability also depends on the finished surface, fabrication and intended use.

2. Put the Grade and Product Standard on Every Order Line

Type 304, UNS S30400, is an austenitic stainless steel; its common EN reference is 1.4301. Type 430, UNS S43000, is ferritic; its common EN reference is 1.4016. These references help identify the material family, but certification must meet the standard actually ordered.

For an ASTM-based sheet order, specify ASTM A240/A240M, the grade and the agreed edition, with the applicable general requirements of ASTM A480/A480M. An EN-based purchase should state EN 10088-2, the steel number, delivery condition and applicable dimensional requirements.

Do not accept a substitution solely because a supplier calls two grades “equivalent.” If a Russian equipment drawing specifies a GOST grade or another standard, submit the proposed alternative for technical approval before ordering.

3. Approve Fabrication and Finish Before Changing Grade

Formed bowls and welded assemblies

304 offers useful ductility for complex forming. A sink blank still needs to suit the die, drawing sequence and required surface quality. Starting-sheet thickness alone does not establish the wall thickness after drawing.

Standard 430 needs particular care around welds. Grain growth and sensitization can impair weld-area performance. Outokumpu’s Moda range datasheet identifies significant restrictions for its unstabilized 430 product in the as-welded condition. Have the fabricator review the exact material, joint and post-weld requirements before approving a welded 430 component.

For a heavily welded 304 assembly, the designer may specify 304L to reduce sensitization risk. A dual-certified supply is acceptable only when the certificate and purchase requirements support both designations.

Adjacent panels need an agreed appearance

A 304 worktop and 430 cover carrying the same finish description can still look different. Approve samples for each grade, viewed together under the intended lighting, and mark the brushing direction on the drawing.

Specify the visible face, permitted surface defects and film requirements. State whether final polishing happens before or after forming. Film should be suitable for the planned processing and removed according to its supplier’s instructions.

As explained in the worldstainless guide to surface roughness measurement, finish names can encompass a range of roughness values. “2B,” “BA” or “No.4” alone does not establish a guaranteed Ra value or identical appearance. Specify measurable acceptance criteria when required.

4. Choose the Supply Form Around the Production Plan

Use stainless steel sheet for varied job sizes and workshop cutting. Compare sheet dimensions against the nesting layout, keeping the required grain direction aligned with each visible component.

Stainless steel coil can suit repeat production when the workshop has suitable handling, decoiling and leveling equipment. State coil width, inside diameter, maximum coil weight, edge condition and any restrictions on welds or splices.

For outsourced cutting, request blanks by drawing number and revision. Define whether dimensions describe a flat blank or a finished component. Assign responsibility for bend allowances, edge quality, burr limits and dimensional inspection.

There is no single sheet thickness suitable for every commercial worktop or hood. Span, load, folds, reinforcement, vibration and forming all affect the selection. Keep thickness changes under engineering control when comparing prices.

5. Keep 304 and 430 Identifiable Through Cutting and Assembly

1. At receipt: match package labels, grade, heat or coil identification, dimensions and quantity to the purchase order and mill documentation.
2. At cutting: transfer the material identity to the job traveler or approved label before the original sheet marking is lost.
3. At storage: separate 304 and 430 blanks and retain the identity of reusable offcuts.
4. At assembly: check each part code against the approved BOM, especially where both grades have similar finishes.

Agree any positive material identification requirements before supply. Also protect clean sheet surfaces from embedded iron contamination during handling and fabrication; appearance inspection alone cannot confirm material identity.

6. Build an RFQ That Produces Comparable Quotations

Send one schedule with separate lines for each grade, thickness, finish and part family. Include:

• Company name, contact person and equipment application.
• Grade, product standard, edition and delivery condition.
• Sheet, coil or blank dimensions, tolerances and quantity.
• Drawing revision, forming or welding route, and acceptance criteria.
• Surface sample reference, grain direction and film requirements.
• Required mill documentation, traceability and additional inspection.
• Exact delivery address or named delivery point in Krasnodar Krai, requested delivery term and required arrival date.

Attach the drawing tolerances and film specification. Request the mill certificate for each supplied heat, the proposed packing arrangement, order quantity limits, production lead time and all deviations. List any additional test or inspection-document requirements explicitly.

Compare the total quoted cost for the same number of usable blanks: material, finishing, cutting, packing and transport. Ask how offcuts and scrap credits are treated. A lower price per tonne can lose its advantage if the sheet layout wastes material or the finish needs rework.

JUDE Steel is based in Wuxi, China. Treat Krasnodar as the project destination and request a confirmed delivery proposal for the actual order; transit time and commercial terms need to be established in the quotation.

7. Frequently Asked Questions

Can a magnet reliably distinguish delivered 304 from 430?

No. 430 is magnetic, but cold-worked 304 can also become magnetically responsive. Use traceable mill records and an appropriate identification method when verification is required.

Can 430 be used in direct contact with food?

It can be used in suitable applications. Evaluate the food, temperature, cleaning regime, surface condition and equipment requirements. A grade name alone does not establish suitability for every food-contact duty.

Does increasing 430 sheet thickness make it equivalent to 304?

No. Additional thickness can affect stiffness, but it does not change the alloy’s corrosion behavior or welding characteristics. Reassess the grade whenever the service conditions require it.

Can an unmarked offcut be returned to the 304 material rack?

Only after its identity has been reliably re-established through the workshop’s material-control procedure. Visual similarity to a known 304 sheet is insufficient.