Alloy Steel EN36 Round Bar
➡️ UNS G33106 | EN 1.5752 | 15NiCr13 | AISI 3415
➡️ 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:
G33106
Wr. No.:
1.5752
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel EN36 Round Bar
Alloy Steel EN36 Round Bar is a nickel-chromium case-hardening steel known in the British system as EN36 and in BS 970 as 655M13. It contains about 0.12–0.18% carbon, 3.00–3.75% nickel and 0.60–1.10% chromium. Its nearest European grade is 15NiCr13 (1.5752).
EN36 is carburised to give a very hard, wear-resistant surface with a strong, tough core. The high nickel content gives excellent core toughness and good hardenability.
The steel is used where parts must resist heavy loads, shock and wear at the same time. It machines well and can be welded in the annealed condition.
Bars are supplied hot rolled, forged, peeled or turned, usually annealed.
Common applications include heavy-duty gears, shafts, crankshafts, camshafts, couplings and aerospace and automotive parts. Nearest international grades include SAE 3310 and 9310 and JIS SNC815. The old BS 970 system split EN36 into EN36A, EN36B and EN36C, with slightly different carbon and chromium ranges. Today the 655M13 grade, often sold as EN36B, is the most widely stocked. It is chosen for gears and shafts in aircraft, helicopters, racing cars and heavy transmissions, where the part must carry high loads and shocks without the core cracking. Bright drawn bars are also stocked for small gears and pins, and the double-quench route gives the finest core. Because of its high nickel, EN36 costs more than Mn-Cr case-hardening steels, so it is used where core toughness is worth the extra cost. Stock is widely held in the UK and India. Cut pieces and forged blanks can be supplied for gear makers.
Common Applications of Alloy Steel EN36 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 EN36 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS G33106
AISI / SAE
USA
AISI 3310 / SAE 3310, SAE 9310, AISI 3415
EN 10084
Europe
EN 1.5752
BS 970
UK
655M13, 832M13
JIS
Japan
SNC815 / SNC815H
GB/T 3077
China
12CrNi3A
KS
South Korea
SNC815
AFNOR
France
14NCD17 / 16NCD17
UNI
Italy
14NiCr14
Technical Specification for Alloy Steel EN36 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
EN36 / 655M13
-
Standard
BS 970-3 (655M13), nearest EN 10084 15NiCr13
-
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
Annealed
-
Tolerance Standard
EN 10060 (hot rolled), EN 10278 (bright, h9-h11), or as agreed
-
Carbon Equivalent CEV (IIW, calculated from mid-range analysis)
≈ 0.62
-
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 EN36 Round Bar
EN36 Round Bar is ordered to BS 970 as 655M13. As BS 970 is withdrawn, many buyers now order 15NiCr13 (1.5752) to EN 10084.
Carburising is done at about 880–930°C, followed by quenching and tempering at about 150–200°C.
Bars are supplied annealed for machining.
The carbon equivalent is moderate, so welding before carburising is possible with preheat.
A common heat treatment route for EN36 is to carburise at about 880–930°C, cool, refine the core at about 850–880°C, then harden the case at about 760–780°C with an oil quench, followed by tempering at about 150–200°C. This double treatment gives a fine core structure and a hard case. Single-quench cycles are also used, but they give a coarser structure. The order should state case depth, surface hardness, core hardness and any grain size or cleanliness limits. For aerospace work, buyers often order to a customer specification that adds vacuum degassing and inclusion limits.
Annealed bar is limited to about 255 HB for machining. Welding before carburising is possible with preheat, but welds should not cross areas that will be carburised. Bright bars are held to h9–h11.
Chemical Composition for Alloy Steel EN36 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.12
0.18
%
Silicon
Si
0.10
0.35
%
Manganese
Mn
0.30
0.60
%
Phosphorus
P
-
0.040
%
Sulfur
S
-
0.040
%
Chromium
Cr
0.60
1.10
%
Nickel
Ni
3.00
3.75
%
Molybdenum
Mo
-
0.15
%
Chemical Composition
View the chemical composition and applicable material limits for EN36 Round Bar
The table shows the limits published for EN36 (655M13) by UK mills, including a residual molybdenum limit of 0.15%. Check the ordered standard for exact limits.
Carbon at 0.12–0.18% keeps the core tough, while carburising raises surface carbon for a hard case.
Nickel at 3.00–3.75% gives excellent core toughness and hardenability. Chromium at 0.60–1.10% adds hardenability and wear resistance.
In EN36, manganese and silicon deoxidise the steel and add a little hardenability. With about 3% nickel, EN36 has one of the highest nickel levels among common case-hardening steels. Nickel gives the core its excellent toughness and resistance to shock, and it keeps the case less brittle than in plain carbon or Mn-Cr steels. Chromium adds hardenability and helps the case reach full hardness. The low carbon keeps the core ductile. The chemistry is close to the European 15NiCr13 (1.5752) to EN 10084, which has nickel of 3.00–3.50%, and to JIS SNC815. Molybdenum is only a residual, so the steel is not a direct substitute for Ni-Cr-Mo grades such as 18CrNiMo7-6 or SAE 9310.
Phosphorus and sulfur should be kept low for fatigue-critical gears.
Mechanical Properties for Alloy Steel EN36 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (annealed)
700–770
MPa
Yield Strength (annealed)
540
MPa
Elongation (annealed)
25
%
Hardness (annealed)
≤ 255
HB
Core Tensile Strength (carburised and oil hardened, 30 mm)
930–1230
MPa
Core Yield Strength (30 mm)
785
MPa
Core Elongation (30 mm)
10
%
Core Impact Energy Charpy (30 mm)
55
J
Case Hardness after carburising
58–62
HRC
Mechanical Properties
Check the key mechanical properties and performance requirements of EN36 Round Bar
The values shown are reference properties published by UK mills for EN36 in the annealed condition and as core properties of a 30 mm section after carburising and oil hardening. They are for guidance only.
Core strength falls as section size rises, from about 1030–1320 MPa at 11 mm to about 880–1180 MPa at 63 mm. The steel gives high core strength with excellent toughness and a very hard surface.
Specify case depth, surface hardness and core hardness for finished parts. After carburising and hardening, UK mills quote core tensile strength of about 1030–1320 MPa at 11 mm, falling to about 880–1180 MPa at 63 mm, with case hardness of about 58–62 HRC. These are reference figures, not standard minimums. The high core toughness is the main reason to choose EN36 over cheaper Mn-Cr steels. For design, specify the effective case depth to 550 HV or 50 HRC, the surface hardness and the core hardness at a stated position, and test them on a sample from the same heat and furnace load.
Annealed EN36 is soft enough for fast machining.
Dimension / Sizes for Alloy Steel EN36 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
EN 10060 (hot rolled), EN 10278 (bright, 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 EN36 Round Bar
Pricing for Alloy Steel EN36 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 EN36 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 EN36 or 8620?
What is the difference between EN36A, EN36B and EN36C?
Is EN36 the same as 15NiCr13?
Why is EN36 used for aircraft and racing gears?
How is EN36 carburised, welded and machined?
What are the limits of EN36?
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