ISO/TR15510 STAILESS STEEL
X6CrNi18 12 Steel Plate Applications & Ordering Guide
X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) is specified for industrial fabrications where the drawing or material list names this grade. This applications page explains where the grade is used, what service conditions drive selection, and which certificate details belong on the purchase order. Gangsteel supplies X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) with EN 10204 mill test certificates.
Typical Applications and Service Conditions
X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) plate is ordered for pressure equipment, process vessels, heat-exchanger related fabrications, structural members under the governing code, and project packages that call the grade by name. Match the mill test certificate grade mark to the calculation sheet; do not treat near-equivalents as automatic substitutes.
Service drivers include the design temperature and pressure of the governing code (ASME, EN/PED, class society, or project specification), weld procedure qualification needs, toughness or creep allowables where applicable, and inspection scope. Delivery condition Solution annealed should be stated explicitly on the purchase order.
Industry Use Cases
Pressure equipment and process: shells, heads, and related platework when drawings name X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305). Power and energy: boiler and heat-recovery fabrications under the ordered edition. Marine / offshore (when classed): only when the society material list names this exact grade stamp. Always keep heat-number traceability on cut pieces.
Chemical Composition - Supporting Data (X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305))
Tables follow EN 1.4303 (X4CrNi18-12 / AISI 305), the modern number matching ISO/TR 15510 X6CrNi18-12 family pages. Confirm the exact EN number on the MTC if dual-certified to 1.4301 (304).
| Element | Min % | Max % / requirement |
|---|---|---|
| C | - | <=0.06 |
| Si | - | <=1.00 |
| Mn | - | <=2.00 |
| P | - | <=0.045 |
| S | - | <=0.030 |
| N | - | <=0.11 |
| Cr | 17.0 | 19.0 |
| Ni | 11.0 | 13.0 |
Mechanical Properties - Supporting Data (X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305))
Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.
| Property | Requirement |
|---|---|
| Yield Rp0.2, min (annealed flat, typical EN) | 220 MPa |
| Tensile Rm (annealed) | 500-700 MPa |
| Elongation A, min | 45% |
| Delivery | Solution annealed |
Related / Near-Equivalent Grades
Near-equivalents are for cross-reference only. They are not automatic code substitutes. Substitution requires engineer approval and matching certificate scope.
| System | Grade | Note |
|---|---|---|
| EN | 1.4303 / X4CrNi18-12 | Modern EN number |
| AISI/UNS | 305 / S30500 | US twin |
| ASTM | A240 Type 305 | When ordered as A240 |
Frequently Asked Questions
Where is X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) typically applied?
X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) is applied where design documents, class material lists, or purchaser specs name this grade for pressure, process, structural, or marine fabrications as applicable. Match the MTC marking to the drawing.
What service conditions drive selection of X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305)?
Design temperature and pressure, toughness or creep allowables, weldability, corrosion or process media, and the governing code edition drive selection. Delivery condition Solution annealed must align with the ordered specification.
Can a near-equivalent replace X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) on an applications drawing?
Not without redesign and written approval. Near-equivalents differ in chemistry, heat treatment, impact temperature, or product form. Commercial swaps create non-conformance when the dossier names X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305).
What fabrication notes matter for X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305)?
Use approved WPS/PQR packages for the thickness and filler, control heat input, and preserve heat-number traceability on cut pieces. State any supplementary UT, PMI, or impact tests on the purchase order.
What certificate and marking should an applications PO demand?
EN 10204 3.1 is standard; 3.2 when a purchaser-appointed inspector witnesses tests. The MTC should show heat analysis, tensile results, delivery condition, and heat number aligned with X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305).
How should I RFQ X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305) plate from Gangsteel for a project?
Send X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305), thickness x width x length (or nesting list), quantity, delivery condition, optional NDT/PMI, certificate type, destination, and any dual-mark needs. Note the end use when special flatness or cut-to-size packaging is required.
Ordering and Mill Certificates
State grade X6CrNi18-12 (ISO/TR 15510) / EN 1.4303 X4CrNi18-12 (AISI 305), dimensions, quantity, delivery condition, optional NDT/PMI, and certificate (EN 10204 3.1 standard; 3.2 when third-party inspection is ordered). Gangsteel supplies export plate and related products with mill test certificates. Contact Gangsteel for stock and mill production RFQs.