Public RFQ reference dataset
Alloy steel grade routes without false equivalence.
Six grade families from JOTAIN's public round-bar range. The data keeps designation systems separate, records the published supply route, and states what a buyer still needs to settle in the RFQ.
At a glance
Published route, size, and condition
The dimensions below are JOTAIN supply-review ranges, not dimensions guaranteed by a material standard and not an inventory promise.
| Route | Standard systems | Published diameter | Published length | Published condition | Substitution status |
|---|---|---|---|---|---|
| 42CrMo4 / SAE 4140 | ISO / EN; SAE; JIS; GB/T; ASTM | 20–400 mm | 3–12 m | Quenched and tempered (QT) | Commonly compared routes; not an automatic equivalence |
| 40Cr | GB/T; ISO / EN; JIS | 20–300 mm | 3–12 m | Annealed / quenched and tempered | Comparison routes; purchaser approval required before substitution |
| CK45 / C45 / SAE 1045 | Legacy DIN drawing language; ISO / EN; SAE; JIS; GB/T | 20–350 mm | 3–12 m | Hot rolled / normalized / annealed | Medium-carbon comparison routes; not interchangeable without review |
| 34CrNiMo6 / SAE 4340 | ISO / EN; SAE; ASTM | 20–400 mm | 3–12 m | Quenched and tempered (QT) | Commonly compared routes; buyer must approve any change |
| 35CrMo | GB/T; ISO / EN; SAE | 20–350 mm | 3–12 m | Quenched and tempered (QT) | Comparison routes; full-table review and purchaser approval required |
| 65Mn grinding-rod route | GB/T; JIS | 60–160 mm | Fixed length to accepted order | Heat treated / cut to length | Separate standard routes; not automatic equivalents |
Record details
What each RFQ route actually says
42CrMo4 / SAE 414042crmo4-sae-4140
- Designation routes
- 42CrMo4 / 1.7225 (ISO or EN route); SAE 4140 (SAE J404 chemistry route); SCM440 (JIS route); 42CrMo (GB route)
- Standard systems
- ISO / EN; SAE; JIS; GB/T; ASTM
- Country / region routes
- International / Europe; United States; Japan; China
- Substitution status
- Commonly compared routes; not an automatic equivalence
- Controlling basis
- Name one material or product standard and edition. Do not merge chemistry limits from separate standards.
- Product form
- Round bar
- Published dimensions
- Diameter: 20–400 mm
Length: 3–12 m - Condition and surface route
- Quenched and tempered (QT)
Black / peeled / machined - RFQ checks
- Standard and edition; diameter; condition or strength class; test position; sampling; result document
- Mapped official records
- ISO 683-2:2016 - Alloy steels for quenching and tempering
- SAE J404_200901 - Chemical Compositions of SAE Alloy Steels
- ASTM A322-24 - Steel Bars, Alloy, Standard Grades
- ASTM A434/A434M-24 - Quenched-and-tempered alloy steel bars
- GB/T 3077-2015 - Alloy structure steels
- JIS G 4053:2026 - Low-alloyed steels for machine structural use
- Public product route
- https://jotainmaterials.com/products/42crmo4-4140-round-bar/
40Cr40cr
- Designation routes
- 40Cr (GB route); 41Cr4 (ISO or EN route); SCr440 (JIS route)
- Standard systems
- GB/T; ISO / EN; JIS
- Country / region routes
- China; International / Europe; Japan
- Substitution status
- Comparison routes; purchaser approval required before substitution
- Controlling basis
- Compare the full ordered chemistry, condition, dimensions, properties, and testing requirements.
- Product form
- Round bar
- Published dimensions
- Diameter: 20–300 mm
Length: 3–12 m - Condition and surface route
- Annealed / quenched and tempered
Hot rolled / forged / machined after review - RFQ checks
- Governing standard and edition; condition; diameter; property target; test position; sampling; result document
- Mapped official records
- Public product route
- https://jotainmaterials.com/products/40cr-round-bar/
CK45 / C45 / SAE 1045ck45-c45-sae-1045
- Designation routes
- CK45 (legacy DIN drawing language); C45E / 1.1191 and C45 / 1.0503 (EN routes); SAE 1045; S45C (JIS route); 45 (GB route)
- Standard systems
- Legacy DIN drawing language; ISO / EN; SAE; JIS; GB/T
- Country / region routes
- Germany / Europe; International / Europe; United States; Japan; China
- Substitution status
- Medium-carbon comparison routes; not interchangeable without review
- Controlling basis
- Keep each designation under its own standard. State product form, condition, dimensions, tests, and certificate separately.
- Product form
- Round bar
- Published dimensions
- Diameter: 20–350 mm
Length: 3–12 m - Condition and surface route
- Hot rolled / normalized / annealed
As ordered; rough machining and custom lengths after review - RFQ checks
- Named designation and standard; condition; diameter; property target; test position; inspection document
- Mapped official records
- Public product route
- https://jotainmaterials.com/products/ck45-1045-round-bar/
34CrNiMo6 / SAE 434034crnimo6-sae-4340
- Designation routes
- 34CrNiMo6 / 1.6582 (ISO or EN route); SAE 4340 (SAE J404 chemistry route)
- Standard systems
- ISO / EN; SAE; ASTM
- Country / region routes
- International / Europe; United States
- Substitution status
- Commonly compared routes; buyer must approve any change
- Controlling basis
- Name the controlling product standard, QT class or property target, diameter, and required results.
- Product form
- Round bar
- Published dimensions
- Diameter: 20–400 mm
Length: 3–12 m - Condition and surface route
- Quenched and tempered (QT)
Hot rolled / forged / machined - RFQ checks
- Product standard; condition or QT class; diameter; test position; sampling; UT scope; result document
- Mapped official records
- Public product route
- https://jotainmaterials.com/products/34crnimo6-round-bar/
35CrMo35crmo
- Designation routes
- 35CrMo (GB route); 34CrMo4 (ISO or EN route); SAE 4135
- Standard systems
- GB/T; ISO / EN; SAE
- Country / region routes
- China; International / Europe; United States
- Substitution status
- Comparison routes; full-table review and purchaser approval required
- Controlling basis
- Use the chemistry table in the governing standard and keep the ordered condition and property basis separate.
- Product form
- Round bar
- Published dimensions
- Diameter: 20–350 mm
Length: 3–12 m - Condition and surface route
- Quenched and tempered (QT)
Hot rolled / forged / machined - RFQ checks
- Governing standard; QT target; diameter; required results; test position; sampling; UT scope
- Mapped official records
- Public product route
- https://jotainmaterials.com/products/35crmo-round-bar/
65Mn grinding-rod route65mn-grinding-rod
- Designation routes
- 65Mn (GB/T spring-steel route); SUP6 or SUP6A (JIS spring-steel route). Any other regional designation needs its own governing standard and clause-level review.
- Standard systems
- GB/T; JIS
- Country / region routes
- China; Japan
- Substitution status
- Separate standard routes; not automatic equivalents
- Controlling basis
- The accepted order must fix the grade standard, rod diameter, heat-treatment lot, hardness method and locations, acceptance band, and trial terms.
- Product form
- Finished grinding rod / round-bar feedstock
- Published dimensions
- Diameter: 60–160 mm
Length: Fixed length to accepted order - Condition and surface route
- Heat treated / cut to length
Black / peeled / processed after route review - RFQ checks
- Standard; diameter and length; lot definition; hardness method and locations; straightness sampling; operating history; trial acceptance
- Mapped official records
- Public product route
- https://jotainmaterials.com/products/65mn-grinding-rod/
How to read it
A route map, not a substitute for the standard.
A comparison route is not a substitution approval. Source links identify standard families and editions, not compliance evidence for a specific heat, bar, or finished part. The accepted order and its named standard, edition, condition, dimensions, tests, certificate, and purchaser approvals control supply.
This dataset deliberately omits merged chemistry and mechanical-property tables. Those figures change with the named standard, product form, condition, diameter or ruling section, test position, and class. The RFQ should identify that basis before a property table is selected.
Reference trail
Official standard-route records
These links identify the official standard families and editions mapped to the individual route notes. A catalogue record is not compliance evidence for a supplied heat or finished part.
- ISO 683-1:2016 - Non-alloy steels for quenching and tempering — Official catalogue record for the ISO product and delivery route. The named edition remains current but is under systematic review as of this dataset version.
- ISO 683-2:2016 - Alloy steels for quenching and tempering — Official catalogue record for the ISO product and delivery route. The named edition remains current but is under systematic review as of this dataset version.
- SAE J403_202402 - Chemical Compositions of SAE Carbon Steels — Official SAE record for SAE carbon-steel chemistry designations. It is not a complete bar property or heat-treatment contract.
- SAE J404_200901 - Chemical Compositions of SAE Alloy Steels — Official SAE record for SAE alloy-steel chemistry designations. It is not a complete quenched-and-tempered bar property contract.
- ASTM A322-24 - Steel Bars, Alloy, Standard Grades — Official active ASTM product-route record for hot-wrought alloy steel bars. It applies only when the accepted order invokes it.
- ASTM A434/A434M-24 - Quenched-and-tempered alloy steel bars — Official active ASTM product-route record. The accepted order still has to name the class, size basis, tests, and document requirements.
- GB/T 3077-2015 - Alloy structure steels — Official Chinese national-standard catalogue record for the GB alloy structural-steel route.
- GB/T 699-2015 - Quality carbon structure steels — Official Chinese national-standard catalogue record for the GB quality carbon structural-steel route.
- GB/T 1222-2025 - Spring steels — Official current Chinese national-standard catalogue record for the spring-steel material route. It does not define finished grinding-rod service performance.
- JIS G 4051:2023 - Carbon steels for machine structural use — Official JSA catalogue record for the Japanese machine-structural carbon-steel product route.
- JIS G 4053:2026 - Low-alloyed steels for machine structural use — Official JSA catalogue record for the current Japanese machine-structural low-alloy steel product route.
- JIS G 4801:2021 - Spring steels — Official JSA catalogue record for the Japanese spring-steel material route. It does not define finished grinding-rod service performance.