Alloy Steel 15CrMo Round Bar
➡️ 15CrMo5 | EN 1.7335 | UNS G41180
➡️ 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:
G41180
Wr. No.:
1.7335
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel 15CrMo Round Bar
Alloy Steel 15CrMo Round Bar is a low-carbon chromium-molybdenum heat-resistant steel to the Chinese standard GB/T 3077. It contains about 0.12–0.18% carbon, 0.80–1.10% chromium and 0.40–0.55% molybdenum.
This pearlitic steel is designed for service at elevated temperatures, usually up to about 510–550°C in steam and hot gas systems. Molybdenum gives creep strength, and chromium improves oxidation resistance and structural stability. At 0.12–0.18% carbon, 15CrMo welds easily and stays tough.
The same steel type is used for boiler tubes under the name 15CrMoG in GB/T 5310. Round bars are used for forgings, flanges, fittings, valve parts and fasteners in the same systems.
Bars are supplied hot rolled or forged, usually normalised and tempered, and can be peeled or turned.
Common applications include boiler and superheater parts, steam pipe flanges and fittings, headers, valve bodies, bolts and forgings for power plants, refineries and petrochemical heaters. The nearest European grade is 13CrMo4-5 (1.7335), and the nearest American forging grade is ASTM A182 F12. These are close in type but not identical in chemistry. Compared with plain carbon steel, the 0.40–0.55% molybdenum lets 15CrMo keep useful strength in long service at elevated temperature, while its low carbon keeps welds tough. It is one of the most common alloy steels in Chinese boiler and refinery systems, which makes it easy to buy in China and to match with 15CrMoG tubes and 15CrMoR plates in the same plant. Forgings, flanges and bar for fittings can also be supplied, cut to length and marked with heat numbers so that they can be traced through fabrication and inspection.
Common Applications of Alloy Steel 15CrMo 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 15CrMo Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS G41180 / K11562 / K11572
ASTM / AISI / ASME
USA
Grade 12 / A182 F11 / 4118
EN / DIN
Europe
EN 1.7335 (13CrMo4-5 / 13CrMo44)
JIS
Japan
SCM415 / STBA22 / SCMV2
KS
South Korea
SCM415 / STBA22
BS
United Kingdom
BS 620-180 / 1653
AFNOR
France
15CD4.05 / 12CD4
GOST
Russia
15KhM (15ХМ)
Technical Specification for Alloy Steel 15CrMo Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
15CrMo
-
Standard
GB/T 3077
-
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
Normalised and tempered
-
Tolerance Standard
GB/T 702 (hot rolled bars) or GB/T 908 (forged bars), or as agreed
-
Carbon Equivalent CEV (IIW, calculated from mid-range analysis)
≈ 0.53
-
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 15CrMo Round Bar
Alloy Steel 15CrMo Round Bar is ordered to GB/T 3077. For 15CrMo, rolled bar sizes follow GB/T 702 and forged bar sizes follow GB/T 908. The tube version is 15CrMoG to GB/T 5310.
The standard mechanical properties are measured on a 30 mm test blank after normalising at about 900°C with air cooling and tempering at about 650°C with air cooling.
The low carbon equivalent gives good weldability. Preheat and post-weld heat treatment are normally used for pressure parts.
The physical values for 15CrMo are reference data, useful for thermal stress checks. For pressure service, elevated temperature tensile tests, UT and third-party inspection can be ordered.
GB/T 3077-2015 applies its table values to bars up to 80 mm. For bars from 80 to 250 mm, it allows elongation, reduction of area and impact energy to fall by set amounts, for example 1%, 5% and 5% for 80–100 mm, rising to 3%, 15% and 15% for 150–250 mm. Buyers should check large bars against these reduced limits. Pressure parts made from 15CrMo are usually ordered with more than GB/T 3077 requires, such as elevated-temperature yield strength, and the purchase order should list these tests. The matching plate grade is 15CrMoR to GB/T 713.
Chemical Composition for Alloy Steel 15CrMo Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.12
0.18
%
Silicon
Si
0.17
0.37
%
Manganese
Mn
0.40
0.70
%
Phosphorus
P
-
0.030
%
Sulfur
S
-
0.030
%
Chromium
Cr
0.80
1.10
%
Molybdenum
Mo
0.40
0.55
%
Chemical Composition
View the chemical composition and applicable material limits for 15CrMo Round Bar
The table shows the GB/T 3077 limits for 15CrMo in the high-quality grade.
Carbon is kept low at 0.12–0.18% for good weldability and toughness. Chromium at 0.80–1.10% improves oxidation resistance and structural stability at elevated temperature.
Molybdenum at 0.40–0.55% is the main creep-strengthening element. It strengthens the ferrite and slows softening at service temperature.
In 15CrMo, silicon and manganese deoxidise the steel. Phosphorus and sulfur in 15CrMo are held low because they weaken welds and grain boundaries over time. The molybdenum range of 0.40–0.55% is the highest among the common Chinese Cr-Mo structural grades. This is what gives 15CrMo its creep strength. Chromium at 0.80–1.10% protects against steam and gas oxidation and slows the breakdown of carbides during long service. Manganese at 0.40–0.70% is kept moderate for weldability. Silicon at 0.17–0.37% deoxidises the steel. The chemistry is close to the European 13CrMo4-5 (1.7335), which allows carbon of 0.08–0.18% and molybdenum of 0.40–0.60%, and to ASTM A182 F12, but these grades are not identical, so pressure-code approval is needed before substitution. Buyers of 15CrMo for creep service often cap copper and nickel residuals on the order.
For long service, low residual elements help limit embrittlement over many years at temperature.
Mechanical Properties for Alloy Steel 15CrMo Round Bar
Mechanical Property
Value
Unit
Tensile Strength Rm (GB/T 3077, 30 mm blank, N+T)
≥ 440
MPa
Yield Strength ReL (GB/T 3077, N+T)
≥ 295
MPa
Elongation A (GB/T 3077, N+T)
≥ 22
%
Reduction of Area Z (GB/T 3077, N+T)
≥ 60
%
Impact Energy KU2 (GB/T 3077, N+T)
≥ 94
J
Hardness (annealed or high-temperature tempered)
≤ 179
HBW
Mechanical Properties
Check the key mechanical properties and performance requirements of 15CrMo Round Bar
The values shown are GB/T 3077 minimum requirements for 15CrMo on a 30 mm test blank after normalising at about 900°C and tempering at about 650°C. The 94 J impact value for 15CrMo is a KU2 U-notch result.
The steel has moderate strength and very high toughness at room temperature. Its main value is creep resistance at elevated temperature, which should be taken from creep data and design codes.
Delivered 15CrMo bar must not exceed 179 HBW. Specify elevated temperature properties where the design requires them. GB/T 3077 requires 15CrMo to reach tensile strength of at least 440 MPa, lower yield strength of at least 295 MPa, elongation of at least 22%, reduction of area of at least 60% and U-notch impact energy of at least 94 J, tested on a 30 mm blank after normalising and tempering. These values show a soft, very tough steel. Its value lies in creep resistance at about 510–550°C, not room-temperature strength. For pressure design, allowable stresses come from the relevant boiler or pressure vessel code and are based on creep and rupture data. Weld hardness after post-weld heat treatment is a useful check that the heat-affected zone has been properly tempered.
Dimension / Sizes for Alloy Steel 15CrMo 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
GB/T 702 (hot rolled bars) or GB/T 908 (forged bars), or as agreed
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per GB/T 702 / GB/T 908 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 15CrMo Round Bar
Pricing for Alloy Steel 15CrMo 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 15CrMo 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 15CrMo or 12Cr1MoV?
What is the difference between 15CrMo and 15CrMoG?
Is 15CrMo equivalent to 13CrMo4-5 or ASTM A182 F12?
What temperature can 15CrMo be used at?
How is 15CrMo heat treated, welded and machined?
What are the limits of 15CrMo?
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