1.7225 / SCM440 / SAE4140 / 42CrMo Alloy Steel Round Bar of Special
Tool Steel
► Equivalent Grades
| GB(China) | DIN(German) | AISI(USA) | JIS(Japan) |
| 42CrMo | 1.7225 | SAE4140 | SCM440 |
► Chemical Composition (%)
| C | Si | Mn | Cr | Mo | P | S | Ni |
| 0.38~0.45 | 0.17~0.37 | 0.50-0.80 | 0.90~1.20 | 0.15-0.25 | ≤0.03 | ≤0.03 | ≤0.25 |
► Available Dimensions
| Round bar (mm) | Flat Bar (mm) |
| Diameter | Length | Thickness | Width | Length |
| 16-450 | 4000-10000 | 20-120 | 155-610 | 4000-10000 |
► Delivery State
Hot Rolled, Black Surface
Q+T: 28-34 HRC.
Annealed: HBS<=235.
► Delivery Time
For abundant stock, 7-15 days. For customized products, 30-50 days.
We have full set of equipement (sawing machine/grinding/polishing
machine) to make customer's specification.
► Our Service
a. Sizes, materials and others are all at your requirements and can
be changed;
b. Price varies on materials, dimensions, finish craft and
different payments;
c. We are direct manufacture in machinery manufacturing work with
experience of several decades;
d. Detail production design will be made according to information
you offered;
e. We have adequate inventory, so that we can quick delivery;
f. The most important is that we have advanced equipment.
► Application
It used for section large forgings, such as locomotive traction
gears, with supercharger drive gear,
the rear axle, the connecting rod and the spring load greatly
clip,oil drill pipe joints and fishing tools,etc.
EN 1.7225---4140 is a high alloy austenitic stainless steel. The
grade is intended for use under severe corrosive conditions. The
steel grade was originally developed to resist corrosion in dilute
sulphuric acid. EN 1.7225 is fully austenitic, and is less
sensitive to precipitation of ferrite and sigma phase than
conventional austenitic grades with high molybdenum content. Due to
the combination of relatively high contents of chromium, nickel,
molybdenum and copper, EN 1.7225 has good resistance to general
corrosion, particulary in dilute sulphuric acid. It is non-magnetic
in the annealed condition but may become slightly magnetic as a
result of cold-working or welding.
Design features
⇒ Good resistance to uniform corrosion
⇒ Good resistance to pitting and crevice corrosion
⇒ Very good resistance to stress corrosion cracking
⇒ Good resistance to intercrystalline corrosion
⇒ Good formability and weldability
Corrosion resistance
Uniform corrosion Uniform corrosion is characterized by a uniform
corrosion of the steel surface in contact with the corrosive
medium. Resistance is normally considered good if the corrosion
rate is less than 0.1 mm/year. As a result of its high chromium,
nickel and molybdenum contents and its alloying with copper, EN
1.7225 is passivated even in reducing environments such as dilute
sulphuric acid and formic acid. Its high nickel content contributes
towards its relatively low corrosion rate in the active state.
Intercrystalline corrosion
EN 1.7225 has a very low carbon content. This means that there is
very little risk of carbide precipitation in connection with
ordinary heat treatment and welding. The risk of intercrystalline
corrosion after ordinary heat treatment and welding is thereby
eliminated.
