Product reference photographs. Confirm grade, finish and supply specification with your enquiry.

Alloy engineering steel plate

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.

Product form: Plate
Surface / finish: Alloy steel
Grade / standard: 34CrMo4, 42CrMo4, 50CrMo4, 51CrV4; AISI grades separately specified

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Product details

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.

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Product specifications

Product specifications for Alloy engineering steel plate
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

Ranges vary with grade, finish and order specification. Confirm the required dimensions, coating and availability in your quotation.

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.

Rolling, processing and production facilities

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Stock & warehouse

Hot rolled, galvanized and color coated material in warehouse settings. Ask our team to confirm current availability for your grade, dimensions and quantity.

Plate and sheet stock in covered storage

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.

Quality requirements

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.

Protective packing, loading and export shipment

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.

Certificates & verification documents

Request the original document issued for the supplying company, product scope and order. Material test reports and conformity documents are checked against the named holder, issuing body and validity period.

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.

Request applicable documents

Frequently asked questions

What should I include in my enquiry?

Send the product, grade or standard, dimensions, quantity, required finish and destination. Describe the end use if the specification is still being developed.

Can I request a particular size or finish?

Yes, include your required size and finish in the enquiry. Availability and any processing requirements must be confirmed in the quotation.

How are minimum order and lead time confirmed?

They depend on grade, dimensions, processing and quantity. We confirm them for the particular order rather than publish one figure for every product.

What documents should I request?

State the material test document, inspection scope and other purchasing documents required for your project. Agree these with the order.