Alloy Steel 25CrMo4 Round Bar
➡️ UNS G41300 | EN 1.7218 | AISI 4130 | ASTM A29
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Alloy Steel
UNS Number:
G41300
Wr. No.:
1.7218
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel 25CrMo4 Round Bar
Alloy Steel 25CrMo4 Round Bar is a low-carbon chromium-molybdenum steel for quenching and tempering to EN 10083-3, with material number 1.7218. It contains about 0.22–0.29% carbon, 0.90–1.20% chromium and 0.15–0.30% molybdenum.
Because its carbon content is lower than that of 34CrMo4 and 42CrMo4, the steel reaches moderate strength after quenching and tempering but keeps very good toughness and better weldability. In 25CrMo4, molybdenum also gives useful strength at moderate temperatures, which suits flanges and bolting.
The grade is also used in the normalised condition and for pressure parts and fittings, where its creep strength at moderate temperatures is useful. It is well known in the aerospace and automotive sectors as the European counterpart of the American 4130 family.
Bars are supplied hot rolled or forged, in the soft annealed (+A), treated for shearing (+S), normalised or quenched and tempered (+QT) condition. 25CrMo4 bars can be finished by peeling, turning or cold drawing.
Common applications include shafts, axles, steering parts, flanges, valve bodies, fasteners, hydraulic parts, gas cylinder components, and welded structural parts that need a good balance of strength and toughness. Nearest international grades include AISI 4130 and JIS SCM430, which are similar but not identical. Its lower carbon lets thick sections be water quenched with less risk of cracking, and its carbon equivalent of about 0.64 makes welding simpler than with 34CrMo4 or 42CrMo4. That balance suits parts that are welded into assemblies or must absorb shock loads, where toughness matters more than peak strength. It is widely stocked in Europe.
Common Applications of Alloy Steel 25CrMo4 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for 25CrMo4 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS G41300
ASTM A29 / SAE J404
USA
4130
EN
Europe
1.7218 (25CrMo4)
BS
United Kingdom
708A25 / 708M25 / CFS10
JIS G4053
Japan
SCM430 / SCM420
KS D 3867
South Korea
SCM430
GB/T 3077
China
30CrMo / 25CrMo
AFNOR
France
25CD4 / 25CD4S
UNI
Italy
25CrMo4
ISO 683-2
International
25CrMo4
Technical Specification for Alloy Steel 25CrMo4 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
25CrMo4 / 1.7218
-
Standard
EN 10083-3 (forgings EN 10250-3)
-
Product Form
Round bar (hot rolled, forged or bright)
-
Diameter (supply range)
10–500
mm
Length (random)
3–6
m
Manufacturing Process
Hot rolled or forged, optional peeling, turning, cold drawing or grinding
-
Production Route
EAF or BOF + ladle refining + vacuum degassing
-
Surface Finish
Black, shot blasted, peeled, turned, cold drawn or ground
-
Heat Treatment / Delivery Condition
+A, +S, normalised or +QT as ordered
-
Tolerance Standard
EN 10060 (hot rolled), EN 10278 (bright, h9-h11), ASTM A29 / A484 style tables for US orders
-
Carbon Equivalent CEV (IIW, calculated from mid-range analysis)
≈ 0.64
-
Density
7.85
g/cm³
Thermal Conductivity at 20°C
42
W/m·K
Coefficient of Thermal Expansion 20–100°C
11.5
µm/m·K
Specific Heat at 20°C
460
J/kg·K
Modulus of Elasticity at 20°C
210
GPa
Magnetic Properties
Ferromagnetic
-
Testing / Inspection
Chemical analysis, hardness, tensile and impact where specified, UT (EN 10308 / SEP 1921 / ASTM A388), grain size, Jominy on request
-
Certification
EN 10204 3.1 mill test certificate (3.2 on request)
-
Technical Specifications
Get the key technical specifications for Alloy Steel 25CrMo4 Round Bar
Alloy Steel 25CrMo4 Round Bar is ordered to EN 10083-3 for quenched and tempered alloy steels. For flanges and forged fittings, 25CrMo4 can be ordered to EN 10250-3. The delivery condition, such as +A, normalised or +QT, and the ruling section should be stated on the order.
Hardening is usually done from about 840–880°C with water or oil quenching, followed by tempering at about 540–680°C. Normalising is done at about 860–900°C.
The lower carbon content gives a lower carbon equivalent than 42CrMo4, which makes welding easier. Preheat is still recommended for thicker sections.
Physical data for 25CrMo4 are reference values. Standard tests include heat analysis, tensile, hardness and impact where specified. Ultrasonic testing and grain size checks can be ordered.
In EN 10083-3, 25CrMo4 +QT properties are given only up to 160 mm, and the minimum yield strength in the largest band is just 400 MPa, because its lower carbon limits the strength of thick sections. For bigger parts, order normalised bar or agree properties with the mill. Soft annealed hardness is limited to 212 HB. For welded assemblies, ask the supplier for the actual carbon equivalent from the heat analysis, and qualify the welding procedure on the same grade and thickness. For pressure equipment, check whether the design code requires a different product standard, such as EN 10269 for bolting or EN 10222-2 for forgings.
Chemical Composition for Alloy Steel 25CrMo4 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.22
0.29
%
Silicon
Si
-
0.40
%
Manganese
Mn
0.60
0.90
%
Phosphorus
P
-
0.025
%
Sulfur
S
-
0.035
%
Chromium
Cr
0.90
1.20
%
Molybdenum
Mo
0.15
0.30
%
Chemical Composition
View the chemical composition and applicable material limits for 25CrMo4 Round Bar
The table shows the EN 10083-3 heat analysis limits for 25CrMo4.
Carbon at 0.22–0.29% sets the strength level after hardening. It is lower than in 34CrMo4 and 42CrMo4, which gives better toughness and weldability at the cost of lower maximum strength.
Chromium at 0.90–1.20% raises hardenability and adds some resistance to oxidation and softening at temperature. Molybdenum at 0.15–0.30% improves hardenability, creep strength and resistance to temper embrittlement.
Manganese in 25CrMo4 adds some hardenability and deoxidises the melt. Phosphorus and sulfur are impurities kept low to protect toughness and weld quality. The lower carbon also reduces the risk of cracking during quenching, so 25CrMo4 can often be water quenched without problems that would affect higher-carbon grades. Manganese at 0.60–0.90% and silicon up to 0.40% are similar to other Cr-Mo grades, so hardenability comes mostly from chromium and molybdenum. The chemistry is close to AISI 4130, which has carbon of 0.28–0.33% and slightly lower manganese. The carbon equivalent from mid-range values is about 0.64, compared with about 0.80 for 42CrMo4, which is why welding is simpler. Buyers should still check the actual heat values on the certificate, because the upper limits can push the carbon equivalent higher.
Mechanical Properties for Alloy Steel 25CrMo4 Round Bar
Mechanical Property
Value
Unit
Yield Strength Re (+QT, d ≤ 16 mm)
≥ 700
MPa
Tensile Strength Rm (+QT, d ≤ 16 mm)
900–1100
MPa
Yield Strength Re (+QT, 16 < d ≤ 40 mm)
≥ 600
MPa
Tensile Strength Rm (+QT, 16 < d ≤ 40 mm)
800–950
MPa
Yield Strength Re (+QT, 40 < d ≤ 100 mm)
≥ 450
MPa
Tensile Strength Rm (+QT, 40 < d ≤ 100 mm)
700–850
MPa
Yield Strength Re (+QT, 100 < d ≤ 160 mm)
≥ 400
MPa
Tensile Strength Rm (+QT, 100 < d ≤ 160 mm)
650–800
MPa
Elongation A (+QT, 16 < d ≤ 40 mm)
≥ 14
%
Impact Energy KV at +20°C (+QT, 16 < d ≤ 100 mm)
≥ 50
J
Hardness (+A, soft annealed)
≤ 212
HB
Mechanical Properties
Check the key mechanical properties and performance requirements of 25CrMo4 Round Bar
The values shown are EN 10083-3 requirements for 25CrMo4 in the quenched and tempered (+QT) condition. They fall as bar diameter rises, because larger sections cool more slowly during quenching.
The grade gives moderate strength with high impact toughness. Minimum impact energy of 50 J at room temperature applies in the medium diameter range, which is higher than for 42CrMo4.
In the soft annealed state, hardness is limited for good machinability. For design, use the values that match the ruling section and confirm results on the mill certificate. In EN 10083-3, the +QT minimum yield strength for 25CrMo4 is 700 MPa up to 16 mm, 600 MPa for 16–40 mm, 450 MPa for 40–100 mm and 400 MPa for 100–160 mm, with tensile strength given as a range. The 50 J minimum impact energy is higher than the 35 J required for 42CrMo4, which shows its better toughness. This makes the grade suitable for parts that see shock loads or low temperatures. When the part is welded after heat treatment, the heat-affected zone will soften or harden locally, so post-weld heat treatment is often needed to restore uniform properties.
Dimension / Sizes for Alloy Steel 25CrMo4 Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
10–500 (forged sizes on request)
mm
Standard Length (random)
3–6
m
Custom / Cut-to-Length
Available on request
-
Diameter Tolerance
Hot rolled: EN 10060 or ASTM A29. Bright: EN 10278 (h9-h11) or as agreed
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per EN 10060 / EN 10278 or as agreed
-
End Condition
Saw cut square, chamfered or as ordered
-
Surface Finish
Black (as rolled or forged), shot blasted, peeled, rough turned, cold drawn, centreless ground
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for 25CrMo4 Round Bar
Pricing for Alloy Steel 25CrMo4 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Alloy Steel 25CrMo4 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
Should I choose 25CrMo4 or 42CrMo4?
Is 25CrMo4 equivalent to AISI 4130?
Why is 25CrMo4 used for welded parts?
What is the maximum section size for 25CrMo4 in the quenched and tempered condition?
How is 25CrMo4 heat treated, welded and machined?
What are the limits of 25CrMo4?
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