Alloy Steel 16MnCr5 Round Bar
➡️ UNS G51150 | EN 1.7131 | AISI 5115 | 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:
G51150
Wr. No.:
1.7131
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel 16MnCr5 Round Bar
Alloy Steel 16MnCr5 Round Bar is a manganese-chromium case-hardening steel to EN 10084, with material number 1.7131. It contains about 0.14–0.19% carbon, 1.00–1.30% manganese and 0.80–1.10% chromium. It is a standard carburising steel for small and medium parts in automotive and general engineering.
After carburising, quenching and tempering, the steel forms a hard, wear-resistant surface layer while the core stays tough and ductile. This combination gives good resistance to surface wear, pitting and bending fatigue in gears and shafts.
Compared with 20MnCr5, 16MnCr5 has slightly lower carbon and alloy content. It therefore has lower hardenability and is best suited to smaller sections, or to parts where a slightly lower core strength is acceptable. It machines well in the annealed or ferrite-pearlite condition and can be welded with care before heat treatment.
Bars are supplied hot rolled, forged, peeled, turned or cold drawn. Common delivery conditions include untreated, +S, +A, +TH and +FP. Grades with hardenability bands (16MnCr5+H, +HH and +HL) are used where distortion and core hardness must be tightly controlled. A sulfur-controlled version, 16MnCrS5, is available for better machinability.
Common applications include gears, gear shafts, camshafts, piston pins, spindles, bushings, measuring tools and small machine parts. The grade is widely stocked, so it is a practical choice for both production parts and repair work. 16MnCr5 is also widely used for bright bars supplied to EN 10277, which suit precision turned parts such as pins, bushes and small shafts. Its lower hardenability helps keep distortion small in thin parts after case hardening.
Common Applications of Alloy Steel 16MnCr5 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 16MnCr5 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS G51150
AISI / SAE / ASTM
USA
5115 / 5120
EN 10084
Europe
EN 1.7131 (16MnCr5)
JIS G4053
Japan
SCr415 / SCM415 / SCr420
GB/T 3077
China
16CrMnH / 20CrMnTi / 15CrMn
KS
South Korea
SCr415 / SCM415
AFNOR
France
16MC5
GOST
Russia
15KhG / 18KhG
ISO 683-11
International
16MnCr5
Technical Specification for Alloy Steel 16MnCr5 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
16MnCr5 / 1.7131
-
Standard
EN 10084 (bright bars EN 10277)
-
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
Untreated, +S, +A, +TH or +FP 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)
≈ 0.55
-
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 16MnCr5 Round Bar
Alloy Steel 16MnCr5 Round Bar is ordered to EN 10084, with bright bars to EN 10277. The delivery condition must be stated on the order, for example +A (soft annealed) for machining or +FP (ferrite-pearlite) for automatic machining with good surface finish.
Hardenability bands can be ordered with the +H, +HH or +HL suffix. These control the Jominy curve and help keep heat treatment distortion predictable in gear production.
Small 16MnCr5 parts are usually carburised at about 880–980°C, quenched and tempered at about 150–200°C. Actual cycles depend on part size and required case depth.
The carbon equivalent shown is calculated from mid-range chemistry for guidance. The physical data for 16MnCr5 are reference values. Standard testing includes heat analysis and hardness, with grain size, Jominy, inclusion rating and ultrasonic testing on request.
Many buyers order 16MnCr5 with controlled sulfur, often shown as 16MnCrS5, for better machining on automatic lathes. This is a separate grade in EN 10084, so name it clearly on the order. For gears and pins, state the hardenability band, grain size and cleanliness requirements, and the tolerance class for bright bars.
Straightness is important for long bright bars used for shafts.
Chemical Composition for Alloy Steel 16MnCr5 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.14
0.19
%
Silicon
Si
-
0.40
%
Manganese
Mn
1.00
1.30
%
Phosphorus
P
-
0.025
%
Sulfur
S
-
0.035
%
Chromium
Cr
0.80
1.10
%
Chemical Composition
View the chemical composition and applicable material limits for 16MnCr5 Round Bar
The table shows the EN 10084 heat analysis limits for 16MnCr5. The +H grades have slightly adjusted ranges combined with hardenability limits.
Carbon at 0.14–0.19% keeps the core tough and ductile. During carburising, the surface carbon is raised so that it becomes hard after quenching. Manganese at 1.00–1.30% and chromium at 0.80–1.10% raise hardenability, so the case and core respond well to oil quenching.
Chromium also helps form hard carbides in the case, which improves wear resistance. Silicon is a deoxidiser. Phosphorus is limited to 0.025% to protect toughness.
Sulfur is allowed up to 0.035%. For better machining, 16MnCrS5 with controlled sulfur can be ordered. Aluminium is often used to keep a fine grain size during carburising. Manganese at 1.00–1.30% and chromium at 0.80–1.10% provide hardenability, while carbon at 0.14–0.19% keeps the core tough and ductile after case hardening. The lower alloy content compared with 20MnCr5 means the core will not harden as deeply in larger sections. Sulfur is limited in the standard grade, but a controlled range can be ordered for better machinability, as in 16MnCrS5.
Aluminium is often present as a grain refiner, which helps keep the grain fine during carburising. Check that the certificate reports it if fine grain is required.
Mechanical Properties for Alloy Steel 16MnCr5 Round Bar
Mechanical Property
Value
Unit
Hardness (+A, soft annealed)
≤ 207
HB
Hardness (+FP, ferrite-pearlite)
140–187
HB
Core Tensile Strength (blank-hardened 30 mm)
780–1080
MPa
Core Yield Strength (blank-hardened 30 mm)
≥ 590
MPa
Core Elongation (blank-hardened 30 mm)
≥ 10
%
Case Hardness after carburising
58–62
HRC
Mechanical Properties
Check the key mechanical properties and performance requirements of 16MnCr5 Round Bar
EN 10084 controls supply hardness for this grade rather than tensile strength. The +A and +FP hardness limits shown are the requirements for bars delivered in those conditions.
For 16MnCr5, the core tensile values are reference data for a 30 mm blank-hardened piece from former DIN 17210. They show the likely core strength after case hardening and are not mandatory EN 10084 limits.
After carburising, quenching and tempering, surface hardness of about 58–62 HRC is normal. Core properties fall as section size increases because of limited hardenability. Buyers should specify case depth, surface hardness and core hardness for finished parts. EN 10084 sets delivery-condition hardness limits and Jominy bands rather than finished-part strength. The reference values shown are for a blank-hardened test piece. For finished parts, buyers should specify case depth, surface hardness and core hardness. Because hardenability is limited, core hardness drops faster with increasing diameter than in 20MnCr5 or 18CrNiMo7-6. For shafts and gears above about 40 mm, check core properties on a trial part.
Fine grain helps keep toughness after long carburising cycles. For thin, precise parts, the moderate hardenability of 16MnCr5 also keeps quench distortion small, which reduces grinding after heat treatment.
Dimension / Sizes for Alloy Steel 16MnCr5 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 16MnCr5 Round Bar
Pricing for Alloy Steel 16MnCr5 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 16MnCr5 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
When is 16MnCr5 a better choice than 20MnCr5?
What is 16MnCrS5, and is it the same as 16MnCr5?
What surface hardness does 16MnCr5 reach after case hardening?
Is 16MnCr5 suitable for small gears and pins?
How is 16MnCr5 round bar case hardened and machined?
Where should 16MnCr5 not be used?
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