Martensitic stainless steel / MATERIAL REFERENCE
A martensitic stainless grade identified as SUS420J1 in JIS. Related GB and ASTM carbon limits differ.
Compare the exact designation, chemical limits and test conditions before specifying material. Related grades are not automatically interchangeable or certified to all four standards.
EN 10028-7
Stainless steel flat products for pressure purposes. Grade, product form, thickness and delivery treatment must match the standard. It is not a bar/profile standard.
Reference: 2016 (DIN EN10028-7:2016-10 current, checked2026-09-09)Specification confirmation requiredJIS420J1 has no established direct EN10028-7 grade. Related EN10088 martensitic grades do not belong to this pressure-flat-product Table2.
ASTM A240/A240M
Plate, sheet and strip for pressure vessels and general applications. Flat-product reference data; not bar/profile specifications or guaranteed Sheye stock capability.
Reference: A240/A240M-20a reference tables (current catalogue: A240/A240M-26)Specification confirmation requiredNo established one-to-one ASTM equivalence. Related Type420 is for comparison only; acceptance uses the explicitly ordered grade and heat treatment.
JIS G 4305
Cold-rolled stainless steel plate, sheet and strip. These flat-product data do not establish a hot-rolled plate, bar or profile specification.
Reference: JIS G 4305:2021 grade references; steelmaker summaries and explicitly labelled 2012 mechanical rowsRelated-grade / reference qualifications applyGB/T 3280
Cold-rolled stainless steel sheet, plate and strip, including slit wide strip. These values are not hot-rolled plate, bar or profile acceptance limits.
Reference: 2015Mass %. ≤ means maximum; ≥ means minimum. A range includes both limits. “—” means no value published in this comparison; it never means zero.
Scroll the table horizontally to compare all standards.
| Element | EN 10028-72016 (DIN EN10028-7:2016-10 current, checked2026-09-09) | ASTM A240/A240MA240/A240M-20a reference tables (current catalogue: A240/A240M-26) | JIS G 4305JIS G 4305:2021 grade references; steelmaker summaries and explicitly labelled 2012 mechanical rows | GB/T 32802015 |
|---|---|---|---|---|
| Designation | No verified direct grade under EN10028-7:2016 | Type 420 / UNS S42000 (related reference only; not SUS420J1/J2 equivalence) | SUS420J1 | 20Cr13 / S42020 |
| C | — | ≥0.15 | 0.16–0.25 | 0.16–0.25 |
| Si | — | ≤1.00 | ≤1.00 | ≤1.00 |
| Mn | — | ≤1.00 | ≤1.00 | ≤1.00 |
| P | — | ≤0.040 | ≤0.040 | ≤0.040 |
| S | — | ≤0.030 | ≤0.030 | ≤0.030 |
| Cr | — | 12.0–14.0 | 12.00–14.00 | 12.00–14.00 |
| Ni | — | ≤0.75 | — | ≤0.60 |
| Mo | — | ≤0.50 | — | — |
Rp0.2 is 0.2% proof strength; Rm is tensile strength; A is elongation. The delivery condition, product form, thickness and specimen basis belong to the value. Rows identify the reference specification or manufacturer summary and its qualifications; values are not design allowables.
| Standard / designation | Condition & thickness | Rp0.2 | Rm | Elongation | Hardness |
|---|---|---|---|---|---|
| EN 10028-7No verified direct grade under EN10028-7:2016 | No confirmed mechanical limits for this reference. Review the exact order specification. | — | — | — | — |
| ASTM A240/A240MType 420 / UNS S42000 (related reference only; not SUS420J1/J2 equivalence) | Annealed reference; Type420 commonly subsequently quenched and temperedConfirm ordered product and heat treatment | No minimum specified in this Table2 row | ≤690 MPa (maximum, Table2 noteQ) | ≥15% (50 mm gauge length) | ≤217 HBW or ≤96 HRBW |
| 690MPa is explicitly a maximum, not a minimum or a quenched-and-tempered guarantee. | |||||
| JIS G 4305SUS420J1 | Annealed cold-rolled plate, sheet and stript >=0.30 mm for proof strength, tensile strength and elongation | ≥225 MPa (when specified by purchaser) | ≥520 MPa | ≥18% | ≤223 HBW or ≤97 HRBS/HRBW or ≤234 HV |
| Reference: JIS G4305:2012 Table 12, independently corroborated by JFE's annealed JIS-grade table for proof/tensile/elongation/HRB/HV. Choose one hardness method; thin-gauge restrictions apply. Values describe annealed supply, not properties after customer hardening. Confirm the contractual edition and specimen requirements. | |||||
| GB/T 328020Cr13 / S42020 | AnnealedCold-rolled flat products; see test-thickness notes | ≥225 MPa | ≥520 MPa | ≥18% | HBW ≤223 / HRB ≤97 / HV ≤234 |
| A50 for t ≤3 mm; elongation/hardness reference only if t <0.3 mm. | |||||
ASTM A240 covers flat products; EN 10028-7 is for pressure-purpose flat products. JIS G4305 and GB/T 3280 cover cold-rolled flat products. Their cold-rolled values must not be used as acceptance limits for hot-rolled plate, bars or profiles. Confirm the standard edition and all supplementary requirements in the purchase order and mill test certificate.
Chemical values are cast-analysis mass percentages. A dash/omitted element means no limit stated in the selected table, never zero content. Cross-standard grade names are comparison references, not automatic equivalence or proof of Sheye certification.
JIS420J1 has no established direct EN10028-7 grade. Related EN10088 martensitic grades do not belong to this pressure-flat-product Table2.
Chemistry is heat-analysis mass percent. Omitted elements have no requirement in the cited row, not zero. A480/A480M governs product-analysis tolerances and general requirements. Mechanical values use the printed SI column. ASTM regards SI and inch-pound systems as independent: do not convert ksi to generate an SI acceptance limit. Room-temperature Table 2 reference properties. Confirm delivery heat treatment, specimen preparation, dimensional tolerances and all general requirements against the contractual A480/A480M edition. Yield is based on 0.2% offset; a 0.5% total-extension-under-load alternative is permitted unless otherwise specified. Elongation gauge length is 50 mm or 2 in. HBW and the specified Rockwell scale are alternative permissible methods; thin-gauge superficial hardness provisions apply. The full 2026 numerical tables were not available for verification. Display the reference edition and confirm the contractual edition and certificate before accepting an order.
No established one-to-one ASTM equivalence. Related Type420 is for comparison only; acceptance uses the explicitly ordered grade and heat treatment.
Type 420 / UNS S42000 (related reference only; not SUS420J1/J2 equivalence): ASTM420 has C≥0.15 with no maximum in this row; JIS420J1/J2 have separate bounded C bands. Similar families are not interchangeable certifications.
JSA confirms the 2021 edition remains valid and was reaffirmed on 20 October 2025. Full purchased normative tables and all footnotes were not available for a complete current-edition audit. Listed chemistry is mass percent from primary JIS-grade summaries, not typical mill analysis. Missing cells mean not reproduced or not verified, not zero. Mechanical limits apply to the stated annealed/solution-treated cold-rolled condition at room temperature. Sampling, gauge length, direction, thickness-related rules and acceptance methods require the contractual standard. Corresponding designations are comparisons, not unconditional equivalence or proof that every supplied heat meets all listed standards.
JSSA verifies the JIS sheet/plate grade and listed chemical limits. Ni is governed by a table footnote; its numerical requirement is not reproduced here. Mechanical reference: JIS G4305:2012 Table 12; JFE annealed JIS-grade summary corroboration. See the conditions attached to each mechanical row.
Chemistry is heat analysis, mass %. The GB designation is a related reference, not automatic cross-standard certification. For thickness below 0.3 mm, elongation and hardness are reference values only. A50 is used at thickness ≤3 mm. Mechanical testing of re-rolling feedstock is performed when requested and specified in the contract (8.2). GB carbon 0.16–0.25% differs from JIS SUS420J1. Review complete heat analysis before substitution.
Reference review: 9 September 2026 · Sheye Metal
SHEYE SUPPLY
Sheye supplies 420J1 in coils, strips, sheets. Specify thickness, width or cut length, finish, quantity and the required delivery condition so the material and processing route can be reviewed together.
A martensitic stainless grade identified as SUS420J1 in JIS. Related GB and ASTM carbon limits differ. Specify the full grade designation and standard edition in the enquiry. Any dual-standard certification must be confirmed for the actual material.
Include the mill test certificate requirements, heat traceability, dimensional tolerances and any additional tests. For processed coils or strip, also state edge condition, coil inside diameter, coil weight and surface protection. Processing feasibility is reviewed against the material strength and dimensions.
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