ISO/TR15510 STAILESS STEEL
X7CrNiTi18 10 Steel Plate Applications & Ordering Guide
X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] 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 X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] with EN 10204 mill test certificates.
This page is a standalone technical article. For the primary overview on the original URL, see X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] primary specification page.
Typical Applications and Service Conditions
X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] 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 X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10]. 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 (X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10])
Ti min = 5x(C+N), max 0.70%. Confirm on heat analysis. ISO/TR 15510 X7CrNiTi18-10 maps to EN 1.4541 / ASTM A240 Type 321. Tables follow verified A240-321.
| Element | Min % | Max % / requirement |
|---|---|---|
| C | - | <=0.08 |
| Mn | - | <=2.00 |
| Si | - | <=0.75 |
| P | - | <=0.045 |
| S | - | <=0.030 |
| Cr | 17.0 | 19.0 |
| Ni | 9.0 | 12.0 |
| N | - | <=0.10 |
| Ti | 5x(C+N) | 0.70 |
Mechanical Properties - Supporting Data (X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10])
Confirm thickness, specimen orientation, and any supplementary impact, UT, or hardness requirements on the PO.
| Property | Requirement |
|---|---|
| Tensile strength, min | 515 MPa (75 ksi) |
| Yield strength (0.2% offset), min | 205 MPa (30 ksi) |
| Elongation in 50 mm, min | 40% |
| Hardness, max | 217 HBW / 95 HRB |
| Delivery condition | 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 |
|---|---|---|
| ASME | SA240 Type 321 | ASME twin |
| ASTM | Type 321H / 347 | H-carbon or Nb-stabilized alternatives |
| EN | 1.4541 / X6CrNiTi18-10 | Confirm edition |
| UNS | S32100 | 321 designation |
Frequently Asked Questions
Where is X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] typically applied?
X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] 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. Primary overview: X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10].
What service conditions drive selection of X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10]?
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 X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] 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 X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10].
What fabrication notes matter for X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10]?
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 X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10].
How should I RFQ X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10] plate from Gangsteel for a project?
Send X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10], 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 X7CrNiTi18-10 / EN 1.4541 (AISI 321) [queue key X7CrNiTi18-10], 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.