Corten Steel Plate
Atmospheric corrosion resistant plate that builds its own protective rust instead of paint
Specifications
Alloy Steel Sheet
AISI 4130 4140 Chromium Molybdenum Steel Plate
Heat treatable chrome moly plate cut to blank size for stressed machined parts
AISI 4130 4140 steel plate is a chromium molybdenum alloy structural steel offering high strength, good hardenability, useful toughness and minimal deformation during quenching. Machine shops and component manufacturers working to American drawings specify it for high and moderately stressed parts in the automobile industry and mechanical engineering, typically shafts, connecting rods, crankshafts and screws. Buyers working across markets keep running into the same plate listed as SCM440, 42CrMo4, 38XM, 42CrMo or 1.7225, so this item is stocked and certified against those names together with AISI 4140. Plate is available across 0-1000mm thickness, annealed or quenched and tempered, and cut to the blank size you machine from.
- Product Name — 4140 SCM440 42CrMo4 38XM 42CrMo 1.7225 steel
- Grade — AISI 4130 4140 SCM440 42CrMo4 38XM 42CrMo 1.7225
- Thickness — 0-1000mm
- Size — Customized size
- Technique — Annealed quenched and tempered
Why It Is Specified
Key Benefits of AISI 4130 4140 Steel Plate
Chrome Moly Strength In A Machinable Plate
Chromium and molybdenum give the strength that plain carbon plate cannot reach after heat treatment, while the annealed condition still machines normally.
Predictable Behaviour On Quench
Minimal deformation during quenching keeps finish allowance small, which matters on crankshaft and shaft blanks where straightening is expensive.
Properties Into The Core
Good hardenability means a thick blank does not end up with a soft centre under a hardened skin.
American and International Designations Together
AISI 4140 sits alongside SCM440 42CrMo4 42CrMo 38XM and 1.7225 on the same material, so one stock covers drawings from several markets.
Blanks Cut From Thickness Up To 1000mm
Thickness reaches 1000mm with customized size, so heavy machined parts can be blanked without your shop sawing plate down first.
Processing Before Shipment
Bending welding decoiling cutting and punching are carried out before dispatch so the blank arrives ready for the first machining operation.
Problems It Solves
What This Material Removes From Your Process
Mild Steel Parts Failing Under Load
A plain carbon blank cannot be heat treated to the strength a stressed shaft needs. This chromium molybdenum grade is designed to be quenched and tempered to that level.
Straightening Work After Heat Treatment
Movement on quench adds a straightening operation to every long part. The grade is characterised by minimal deformation during quenching.
Cross Market Grade Confusion
The purchase order says 4140, the mill certificate says 42CrMo4 and inspection asks questions. The material is documented under both names and its other equivalents.
Machine Time Lost To Sawing Plate
Cutting blanks from full plate occupies a saw and creates offcut. Cut to size supply from 0-1000mm thickness delivers the blank directly.
Soft Cores In Heavy Blanks
Hardening depth limits which grades suit thick parts. The hardenability of this alloy carries properties further into the section.
Application Scenarios
Where It Is Used
Machined Shaft Blanks
Drive and transmission shafts where torque loading and post heat treatment straightness set the process.
Engine Connecting Rods
Rods in engine and compressor assemblies carrying reversing loads over long service periods.
Crankshaft Manufacture
Crankshaft blanks needing hardenability through the section and controlled movement on quench.
High Strength Screws and Threaded Parts
Screws and threaded components for stressed assemblies where mild steel fasteners would not hold the load.
General Machine Building Components
Moderately and highly stressed parts across mechanical engineering where a heat treatable alloy plate is called for.
Who It Is For
Buyers Who Specify This Product
- Machining subcontractors buying 4140 blanks for shaft and rod production
- Design engineers on American drawings needing plate certified as AISI 4140
- Automotive component makers sourcing crankshaft and connecting rod stock
- Fastener producers buying alloy plate for high strength screws
- Distributors serving machine shops that order small quantities of cut blanks
- Quality engineers who need one certificate covering 4140 and its SCM440 or 42CrMo4 equivalents
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | 4140 SCM440 42CrMo4 38XM 42CrMo 1.7225 steel |
|---|---|
| Grade | AISI 4130 4140 SCM440 42CrMo4 38XM 42CrMo 1.7225 |
| Thickness | 0-1000mm |
| Size | Customized size |
| Technique | Annealed quenched and tempered |
| Application | Shafts connecting rods crankshafts screws |
| Surface | Raw material milling grinding |
| Processing Service | Bending welding decoiling cutting punching |
| Sample | Available |
| Certificate | Mill test certificate |
| Place of Origin | China |
Technical Features
- Grades 4140 SCM440 42CrMo4 38XM 42CrMo and 1.7225 with AISI 4130 listed
- Chromium molybdenum alloy structural steel
- Thickness 0-1000mm in customized size
- Annealed or quenched and tempered delivery condition
- Surface raw material milling or grinding
- Bending welding decoiling cutting and punching available
- Applications shafts connecting rods crankshafts and screws
- Mill test certificate issued with the plate
Materials
- Chromium molybdenum alloy structural steel in the AISI 4130 and 4140 range
- Equivalent designations SCM440 42CrMo4 42CrMo 38XM and 1.7225
- Supplied annealed for machining or quenched and tempered for strength
Certification
- Mill test certificate supplied with each shipment
Manufacturing
How It Is Made and Processed
Steelmaking to the chromium molybdenum alloy composition
Hot rolling to the ordered plate thickness
Annealing for machinable delivery
Quenching and tempering for the heat treated condition
Surface left as raw material or milled or ground
Cutting blanks to your dimensions
Punching bending and welding on request
Marking and export packing
Quality Control
Checks Before It Ships
- Mill test certificate issued against the ordered grade designation
- Thickness confirmed within the 0-1000mm range before cutting
- Heat treatment condition recorded as annealed or quenched and tempered
- Surface finish checked against the ordered raw milled or ground condition
- Cut blank dimensions verified against the order before packing
Customization
What We Can Change on Your Order
- Blanks cut to your machining drawing rather than standard plate sizes
- Annealed or quenched and tempered supply
- Milled or ground faces where a machining datum is needed
- Hole punching and bending before shipment
- Certificate issued naming AISI 4140 or the equivalent your drawing uses
Comparison
AISI 4130 4140 Steel Plate Against the Alternatives
| Mild carbon steel plate | Mild steel cannot be quenched and tempered to the strength this grade reaches, which is why stressed shafts and rods are made from chrome moly. |
|---|---|
| 1.7225 42CrMo4 plate on a European drawing | It is the same alloy structural steel under a different designation, so one stock and one certificate can serve both drawings. |
| Stainless steel plate | Stainless buys corrosion resistance, not strength through section. For a dry mechanical part this grade gives better mechanical properties for the money. |
Use Guide
Specifying Handling and Welding Notes
- Order annealed plate when the blank is rough machined before heat treatment
- Preheat and control interpass temperature when welding chrome moly to avoid cracking
- Quote the AISI number on the order so the certificate matches your inspection paperwork
- Send finished blank dimensions so heavy plate is not sawn down in your own shop
- Leave grinding stock for the movement that still occurs on quench even with a low distortion grade
- Store cut blanks dry and stacked flat so heavy sections do not take a set
Questions Buyers Ask
AISI 4130 4140 Steel Plate FAQ
What is the difference between AISI 4130 and 4140 here?
Both are chromium molybdenum alloy structural steels in this family and the certificate is issued for the grade you order. Tell us which one the drawing calls and the material is supplied and documented to it.
Which international grades match 4140?
SCM440 42CrMo4 42CrMo 38XM and 1.7225 all cover the same alloy structural steel.
What is the thickest plate you can cut blanks from?
Thickness runs to 1000mm and size is customized, so heavy blanks can be cut rather than shipped as full plate.
Can you supply it already heat treated?
Yes. Quenched and tempered supply is available, as is annealed plate if your shop machines before heat treatment.
Is the plate weldable?
It can be welded, and welding is one of the processing services offered. As a chromium molybdenum alloy it needs preheat and a suitable procedure rather than mild steel practice.
What surface condition will the plate arrive in?
Raw material milling or grinding. Choose the one your first machining operation needs so you are not paying for stock removal twice.
Do you provide the mill test certificate and samples?
A mill test certificate ships with the material and samples are available. Ask for the mill test certificate with your enquiry so the grade documentation is agreed before production.
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