Product reference photographs. Confirm grade, finish and supply specification with your enquiry.
Hot rolled plate & coil
Alloy engineering steel plate
Alloy steel plate for engineering components with grade-specific strength and heat-treatment requirements. Compare the individual grade data below.
- Product form
- Plate
- Surface / finish
- Alloy steel
- Grade / standard
- 34CrMo4, 42CrMo4, 50CrMo4, 51CrV4; AISI grades separately specified
- Thickness
- To the selected grade and plate specification
- Width
- 100–3,000 mm reference supply range
Plan your order
Material & processing
Specify dimensions and tolerances. Include the grade or describe your intended use if it is not yet selected.
Quantity & timing
Share your required tonnage and delivery date. Ask for stock availability, minimum order quantity and the dispatch schedule for your exact specification.
Packing & documents
Include destination, handling limits and required inspection documents so they can be reviewed with the material quotation.
Product details
Alloy engineering steel plate for machined or heat-treated parts must be ordered by both grade and delivery condition. This range includes references for 34CrMo4, 42CrMo4, 50CrMo4 and 51CrV4; select the exact designation required by your component specification. For 42CrMo4 plate, distinguish annealed material from quenched and tempered supply and use the applicable section-thickness basis when reviewing mechanical properties.
Alloy engineering steel plate for machinery parts and engineering components requiring a defined heat-treatment condition. Select the grade, dimensions, finish and inspection requirements for your order.
Grade selection
Select the exact grade and purchasing standard from the tables below.
Delivery condition
Specify surface finish, heat treatment and dimensional tolerances.
Inspection & supply
Agree test documentation, packing and shipment requirements.
Typical application
Machinery parts and engineering components requiring a defined heat-treatment condition.
Machinery parts and engineering components requiring a defined heat-treatment condition.
Explore applicationsProduct specifications
| Product form | Plate |
|---|---|
| Grade / standard | 34CrMo4, 42CrMo4, 50CrMo4, 51CrV4; AISI grades separately specified |
| Manufacturing process | Hot rolled; final heat treatment according to the selected grade |
| Width | 100–3,000 mm reference supply range |
| Cut length | 1–12 m or cut to order |
| Delivery condition | As rolled, normalized or quenched and tempered only as permitted by the selected grade |
| Thickness | To the selected grade and plate specification |
| Dimensional tolerances | To the ordered product standard and agreed drawing |
| Inspection | Material identification, dimensions, surface and specified test report |
| Packaging | Protective wrapping, edge protection and steel strapping as agreed |
Dimensions and finishes depend on the selected grade and processing route; not every size and finish combination is available. The technical tables describe the stated grades and test conditions. Your quotation should identify the exact supply specification and applicable standard.
EN alloy grades — heat analysis
| Grade | C % | Si max. % | Mn % | P max. % | S max. % | Cr % | Mo % | V % |
|---|---|---|---|---|---|---|---|---|
| 34CrMo4 | 0.30–0.37 | 0.40 | 0.60–0.90 | 0.025 | 0.035 | 0.90–1.20 | 0.15–0.30 | — |
| 42CrMo4 | 0.38–0.45 | 0.40 | 0.60–0.90 | 0.025 | 0.035 | 0.90–1.20 | 0.15–0.30 | — |
| 50CrMo4 | 0.46–0.54 | 0.40 | 0.50–0.80 | 0.025 | 0.035 | 0.90–1.20 | 0.15–0.30 | — |
| 51CrV4 | 0.47–0.55 | 0.40 | 0.70–1.10 | 0.025 | 0.025 | 0.90–1.20 | — | 0.10–0.25 |
These are EN grade designations. AISI 4135 / 4140 / 4142 / 6150 must be specified separately; they are not exact interchangeable labels.
42CrMo4 +QT — flat-product mechanical properties
| Ruling thickness t (mm) | Yield min. (MPa) | Tensile (MPa) | A min. (%) | Reduction of area min. (%) | Impact min. (J) |
|---|---|---|---|---|---|
| ≤8 | 900 | 1100–1300 | 10 | 40 | Not specified here |
| >8–20 | 750 | 1000–1200 | 11 | 45 | 35 |
| >20–60 | 650 | 900–1100 | 12 | 50 | 35 |
| >60–100 | 550 | 800–950 | 13 | 50 | 35 |
| >100–160 | 500 | 750–900 | 14 | 55 | 35 |
Quenched and tempered 42CrMo4, EN 10083 reference; ruling section thickness, not bar diameter. These values do not apply to annealed plate, or automatically to 34CrMo4, 50CrMo4, 51CrV4 or AISI 4140.
42CrMo4 — heat-treatment reference
| Process | Temperature | Cooling / condition |
|---|---|---|
| Normalizing | 850–880°C | Air cooling |
| Soft annealing | 800–850°C | Furnace cooling; ≤241 HB reference |
| Hardening | 820–860°C | Oil quench |
| Tempering | 550–650°C | Still-air cooling |
Process reference for 42CrMo4; the qualified heat-treatment procedure depends on section size and required properties.
Surface & processing requirements
Include the downstream process in your enquiry so that the material, dimensions and surface can be reviewed together.
| Cut-to-size requirements | Final length and width, cutting method and edge condition. |
|---|---|
| Forming / fabrication | Describe the downstream forming, pressing, profiling or fabrication operation. |
| Finishing requirements | State whether material will be painted, coated or otherwise finished after delivery. |
| Plate / sheet handling | Confirm lifting method, stack height and protection of edges and surfaces. |
Production & processing
Define the material and the downstream process together. Cutting, slitting or finishing requirements should form part of the order specification.
Material review
Grade, dimensions and surface requirements are checked against the enquiry.
Processing scope
Agree cutting, slitting or forming requirements and the finished product tolerances.
Order inspection
Define acceptance criteria, identification and the requested documentation.
Stock & warehouse
Warehouse photographs illustrate storage and handling. For a current stock check, send the grade, dimensions and tonnage; ask for the available quantity and order-specific material photographs before purchase.
Quality inspection & documentation
Agree the acceptance criteria and required documents before confirming your order.
- Material identificationGrade, standard and requested test documentation.
- Dimensions & surfaceThickness, width, finish and agreed tolerances.
- Order documentsProduct identification, packing list and inspection scope.
Packaging & shipment
Tell us how the material will be transported, unloaded and stored. Specify moisture protection, edge protection, package weight and destination with your enquiry.
| Protection | Moisture barrier, edge protection and surface protection as agreed. |
|---|---|
| Unit weight | Specify the coil or bundle weight for your unloading equipment. |
| Identification | Product, grade, dimensions and order reference on the agreed packing list. |
| Delivery | Confirm destination, transport method and delivery terms in the quotation. |
Material test reports & order documents
Use the document types below to define your quality requirements. Ask Alex or Anna which documents apply to the selected material; document type and inspection scope should be agreed before order confirmation.
| Material test report | Heat or coil number, ordered grade, chemical composition and mechanical test results. |
|---|---|
| Inspection document | Specify the required EN 10204 document type and inspection scope in the enquiry. |
| Conformity documents | Request an original copy showing the issuing body, holder, number, applicable scope and validity. |
Frequently asked questions
What should I include in a 42CrMo4 steel plate quotation?
Specify the standard and grade, plate thickness, finished cut dimensions and quantity. Identify the required delivery condition, machining allowance and any hardness or mechanical-property acceptance requirements. Include the component drawing and inspection-document requirements.
Do 42CrMo4 +QT properties also apply to annealed plate?
No. Use the property table for the ordered heat-treatment condition and applicable ruling thickness. Annealed material and quenched and tempered material must be described separately; agree any subsequent heat-treatment and verification requirements with the order.
Can AISI 4140 be ordered simply as another name for 42CrMo4?
Specify the required standard and complete grade designation. The reference tables do not establish automatic interchangeability between AISI and EN grades. Review the project requirements and obtain approval before accepting any proposed alternative.
How are minimum order and lead time confirmed?
Send your grade, size, tonnage and required delivery date. Ask for separate confirmation of stock availability, any production or processing time, and the dispatch date. Transit time depends on destination and shipment terms; the agreed quotation should state the minimum quantity and schedule.
What documents should I request?
List the required material test report, inspection document type and any third-party inspection in your enquiry. Ask which documents apply to your selected material and agree their scope before ordering. A general company certificate does not replace the material test results for the supplied heat or coil.
Related products
Hot rolled steel plate
Flat plate for structural fabrication and industrial components. Specify the grade, thickness and cutting dimensions for your application.
View specifications
Hot rolled steel coil
Coiled hot rolled steel for further processing, forming and fabrication. Share your target grade, width, thickness and coil requirements.
View specifications
ASTM A36 hot rolled steel plate
Hot rolled structural plate enquiries to ASTM A36. Include thickness, cut size and the inspection documentation required by your…
View specifications