Alloy Steel 35CrMo4 Round Bar
➡️ UNS G41350 | EN 1.7220 | AISI 4135 | 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:
G41350
Wr. No.:
1.7220
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel 35CrMo4 Round Bar
Alloy Steel 35CrMo4 Round Bar is a medium-carbon chromium-molybdenum steel for quenching and tempering. The name 35CrMo4 is a former and national designation for this steel type. In current European standards the standardised grade is 34CrMo4 (1.7220) to EN 10083-3, and 35CrMo4 bars are normally supplied to that grade.
The steel contains about 0.30–0.37% carbon, 0.90–1.20% chromium and 0.15–0.30% molybdenum. After quenching and tempering, it gives higher strength than 25CrMo4 and good toughness, with good hardenability in small and medium sections.
Molybdenum in 34CrMo4 adds hardenability and limits temper embrittlement. The grade can be induction hardened or nitrided for extra surface hardness.
35CrMo4 bars, certified as 34CrMo4, come hot rolled or forged in +A, +S or +QT condition. Peeled, turned and cold-drawn 34CrMo4 bars are all stocked. The nearest American grades are AISI 4135 and 4137, and in Japan the matching grade is SCM435.
Common applications include crankshafts, axles, shafts, gears, bolts and studs, connecting rods, pressure vessel parts, gas cylinders and highly stressed automotive and machinery components. Buyers should note that in some German tool steel listings the name 35CrMo4 is also linked to material number 1.2330, so the order should state the standard and material number clearly. The Chinese grade 35CrMo to GB/T 3077 is sold under a similar name but has slightly different limits, so buyers should confirm which standard applies. In strength, the steel sits between 25CrMo4 and 42CrMo4. Its 40 J impact minimum and lower carbon give it better toughness and lower quench-cracking risk than 42CrMo4, which is why cylinder and axle makers often prefer it.
Common Applications of Alloy Steel 35CrMo4 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 35CrMo4 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS G41350
ASTM / AISI / SAE
USA
4135
EN
Europe
EN 1.7220 (34CrMo4)
BS
UK
708A37 / 708M32 / 708A30
JIS G4053
Japan
SCM435 / SCM435H
GB/T 3077
China
35CrMo
KS D 3867
South Korea
SCM435
AFNOR
France
35CD4 / 34CD4
UNI
Italy
35CrMo4
GOST
Russia
35KHM (35ХМ) / 35XM
SS
Sweden
2234
ISO 683-2
International
34CrMo4
Technical Specification for Alloy Steel 35CrMo4 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
35CrMo4 / 34CrMo4 / 1.7220
-
Standard
EN 10083-3 (as 34CrMo4)
-
Product Form
Round bar (hot rolled, forged or bright)
-
Diameter (supply range)
10–800 (forged)
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 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)
≈ 0.72
-
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 35CrMo4 Round Bar
35CrMo4 Round Bar is normally supplied to EN 10083-3 as 34CrMo4 (1.7220). The order should state the standard, material number, delivery condition and ruling section to avoid confusion with other uses of the 35CrMo4 name.
Hardening is usually done from about 830–870°C with oil or water quenching, followed by tempering at about 540–680°C. The soft annealed condition is used for machining before heat treatment.
EN 10083-3 properties depend on bar diameter. Axle and crankshaft bars of 34CrMo4 are usually ultrasonically tested.
The carbon equivalent is fairly high, so welding needs preheat and post-weld heat treatment. Physical data for 34CrMo4 are reference values.
If the enquiry names 35CrMo4 without a standard, ask the customer whether they mean 34CrMo4 to EN 10083-3, 35CrMo to GB/T 3077, or a customer specification. The chemistry of these grades overlaps, but mechanical requirements and test methods differ. For example, GB/T 3077 tests a 25 mm blank and uses U-notch impact tests, while EN 10083-3 uses V-notch tests on the delivered bar size. EN 10083-3 gives 34CrMo4 +QT properties up to 250 mm. For bright bar, EN 10277 tolerances apply. Record the standard and material number on every certificate and bar tag.
Chemical Composition for Alloy Steel 35CrMo4 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.30
0.37
%
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 35CrMo4 Round Bar
The table shows the EN 10083-3 limits for 34CrMo4 (1.7220), the standardised grade used to supply 35CrMo4 bars.
Carbon at 0.30–0.37% gives high strength after hardening while keeping good toughness. Chromium at 0.90–1.20% raises hardenability and adds some wear resistance.
Molybdenum at 0.15–0.30% improves hardenability, strength after tempering and resistance to temper embrittlement.
Manganese in 34CrMo4 adds hardenability and deoxidises the steel. A controlled sulfur version, 34CrMoS4, is available for better machinability. Compared with 42CrMo4, 34CrMo4 has about 0.07% less carbon. This lowers the maximum hardness after quenching but improves toughness and reduces the risk of quench cracking in complex parts. Manganese at 0.60–0.90% and silicon up to 0.40% are the same as in 42CrMo4, so hardenability is only slightly lower. The Chinese grade 35CrMo has carbon of 0.32–0.40% and chromium of 0.80–1.10%, which overlaps with 34CrMo4 but is not identical. The Japanese grade SCM435 and American AISI 4135 are close relatives. A certificate should show the exact limits of the ordered standard, not a mix of several.
Phosphorus is limited to 0.025% and sulfur to 0.035%. For gas cylinder use, the cylinder standard often sets even lower limits.
Mechanical Properties for Alloy Steel 35CrMo4 Round Bar
Mechanical Property
Value
Unit
Yield Strength Re (+QT, d ≤ 16 mm)
≥ 800
MPa
Tensile Strength Rm (+QT, d ≤ 16 mm)
1000–1200
MPa
Yield Strength Re (+QT, 16 < d ≤ 40 mm)
≥ 650
MPa
Tensile Strength Rm (+QT, 16 < d ≤ 40 mm)
900–1100
MPa
Yield Strength Re (+QT, 40 < d ≤ 100 mm)
≥ 550
MPa
Tensile Strength Rm (+QT, 40 < d ≤ 100 mm)
800–950
MPa
Yield Strength Re (+QT, 100 < d ≤ 160 mm)
≥ 500
MPa
Tensile Strength Rm (+QT, 100 < d ≤ 160 mm)
750–900
MPa
Yield Strength Re (+QT, 160 < d ≤ 250 mm)
≥ 450
MPa
Tensile Strength Rm (+QT, 160 < d ≤ 250 mm)
700–850
MPa
Elongation A (+QT, 16 < d ≤ 40 mm)
≥ 12
%
Impact Energy KV at +20°C (+QT, 16 < d ≤ 40 mm)
≥ 40
J
Hardness (+A, soft annealed)
≤ 223
HB
Mechanical Properties
Check the key mechanical properties and performance requirements of 35CrMo4 Round Bar
The values shown are EN 10083-3 requirements for 34CrMo4 in the quenched and tempered (+QT) condition. Strength falls as diameter rises, while elongation, reduction of area and impact energy rise.
The grade gives high strength with good toughness in small and medium sections. For very large sections, nickel-bearing grades such as 34CrNiMo6 are often preferred.
In the soft annealed condition, hardness is limited to 223 HB for machining. Use the values for the actual ruling section and confirm them on the mill certificate. EN 10083-3 sets +QT minimum yield strength for 34CrMo4 at 800 MPa up to 16 mm, 650 MPa for 16–40 mm, 550 MPa for 40–100 mm, 500 MPa for 100–160 mm and 450 MPa for 160–250 mm, with tensile strength ranges for each band. The minimum impact energy of 40 J is between the values for 42CrMo4 and 25CrMo4. This balance of strength and toughness makes the grade a common choice for gas cylinders, axles and high-strength bolts, where both properties matter.
For bolts, hardness is often capped to reduce the risk of hydrogen cracking. Impact tests at low temperature can be added for cold-climate parts.
Dimension / Sizes for Alloy Steel 35CrMo4 Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
10–800 (forged, larger 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 35CrMo4 Round Bar
Pricing for Alloy Steel 35CrMo4 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 35CrMo4 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 35CrMo4 (34CrMo4) or 42CrMo4?
Is 35CrMo4 the same as 34CrMo4?
Is 35CrMo4 the same as Chinese 35CrMo?
Is 34CrMo4 used for gas cylinders?
How is 35CrMo4 heat treated, welded and machined?
What are the limits of 35CrMo4?
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