Alloy Steel EN19 Round Bar
➡️ UNS G41400 | EN 1.7225 | AISI 4140 | 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:
G41400
Wr. No.:
1.7225
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel EN19 Round Bar
Alloy Steel EN19 Round Bar is a chromium-molybdenum high-tensile steel known in the British system as EN19 and in BS 970 as 709M40. It contains about 0.36–0.44% carbon, 0.90–1.20% chromium and 0.25–0.35% molybdenum. Its closest European grade is 42CrMo4 (1.7225) to EN 10083-3, and the nearest American grade is AISI 4140.
EN19 is usually supplied hardened and tempered to one of the BS 970 tensile conditions, most often condition T (850–1000 MPa). It combines good tensile strength with good ductility and shock resistance, and it has good wear resistance.
The grade can be further surface hardened by induction or nitriding to give a hard, wear-resistant surface. It machines well in the annealed or lower tensile conditions.
EN19 bars come hot rolled, forged, peeled or turned, either annealed or hardened and tempered. The designation EN19T is often used for condition T material.
Common applications include shafts, axles, gears, spindles, studs, bolts, propeller shafts, connecting rods and general engineering parts. BS 970 has been withdrawn and replaced by EN standards, but EN19 remains a common trade name in the UK, India and many export markets. For buyers, the most useful point about EN19 is that each tensile condition is only guaranteed up to a limiting ruling section. UK stockists commonly quote condition T up to about 100 mm, with higher conditions available only in smaller sizes. Pre-hardened EN19T bar is popular because it can be machined straight into finished parts without further heat treatment. Bright EN19T bars in close tolerance are also stocked for precision turned parts.
Common Applications of Alloy Steel EN19 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 EN19 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS G41400
AISI / SAE / ASTM
USA
4140 / ASTM A29 Grade 4140
EN / DIN
Europe
1.7225 (42CrMo4)
JIS
Japan
SCM440
GB/T 3077
China
GB 42CrMo
KS
South Korea
KS SCM440
BS 970
United Kingdom
BS 709M40
IS
India
40Cr4Mo2 / 40Cr4Mo3
ISO 683-2
International
42CrMo4
Technical Specification for Alloy Steel EN19 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
EN19 / 709M40
-
Standard
BS 970-3 (709M40), nearest EN 10083-3 42CrMo4
-
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 or hardened and tempered (conditions R, S, T, U, V)
-
Tolerance Standard
EN 10060 (hot rolled), EN 10278 (bright, h9-h11), or as agreed
-
Carbon Equivalent CEV (IIW, calculated from mid-range analysis)
≈ 0.81
-
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 EN19 Round Bar
EN19 Round Bar is ordered to BS 970 as 709M40, usually in a named tensile condition such as T. Because BS 970 is withdrawn, many buyers now order to EN 10083-3 as 42CrMo4 +QT with equivalent strength. EN19 orders should name either BS 970 709M40 or EN 10083-3 42CrMo4 as the governing document.
Hardening is normally done from about 830–860°C with oil quenching, followed by tempering at about 550–700°C to reach the required condition.
BS 970 tensile conditions apply up to a limiting ruling section. Larger sections may not reach the higher conditions.
EN19 has a high carbon equivalent, so any weld needs preheat and post-weld heat treatment. EN19 bars can be ultrasonically tested and third-party inspected on request.
Most EN19 is stocked in condition T, and many workshops treat EN19T as the default. When ordering, state the tensile condition letter, the bar size and whether the certificate should show BS 970 709M40 or EN 10083-3 42CrMo4. If the finished part is much smaller than the stock bar, the strength at the part surface may differ from the test result at the bar quarter-diameter. For nitrided parts, temper above the nitriding temperature so the core does not soften during nitriding. Ultrasonic testing is often added for bars above about 100 mm.
Chemical Composition for Alloy Steel EN19 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.36
0.44
%
Silicon
Si
0.10
0.35
%
Manganese
Mn
0.70
1.00
%
Phosphorus
P
-
0.035
%
Sulfur
S
-
0.040
%
Chromium
Cr
0.90
1.20
%
Molybdenum
Mo
0.25
0.35
%
Chemical Composition
View the chemical composition and applicable material limits for EN19 Round Bar
The table shows BS 970 limits for 709M40 (EN19). The nearest EN grade, 42CrMo4, has slightly different manganese, molybdenum, phosphorus and sulfur ranges.
Carbon at 0.36–0.44% gives high strength after hardening. Chromium at 0.90–1.20% raises hardenability and wear resistance.
Molybdenum at 0.25–0.35% improves hardenability, strength after tempering and resistance to temper embrittlement.
Manganese adds hardenability and helps deoxidation. Silicon is a deoxidiser. The chemistry of 709M40 differs from 42CrMo4 in small but useful ways. Manganese is set at 0.70–1.00%, a little higher than in 42CrMo4, and molybdenum at 0.25–0.35% is at the upper end of the 42CrMo4 range. Both help hardenability and resistance to softening. Silicon is 0.10–0.35%. Because the two grades overlap strongly, many mills produce heats that meet both 709M40 and 42CrMo4, and dual certification is common. The certificate should show the actual heat analysis so the buyer can confirm both sets of limits. Sulfur-bearing versions for free machining are also produced.
Phosphorus and sulfur are held low to protect toughness and fatigue strength. For bolts and highly stressed shafts, the actual sulfur level on the certificate is worth checking, because high sulfur lowers transverse toughness.
Mechanical Properties for Alloy Steel EN19 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (condition R)
700–850
MPa
Hardness (condition R)
201–255
HB
Tensile Strength (condition S)
775–925
MPa
Hardness (condition S)
223–277
HB
Tensile Strength (condition T)
850–1000
MPa
Hardness (condition T)
248–302
HB
Tensile Strength (condition U)
925–1075
MPa
Hardness (condition U)
269–331
HB
Tensile Strength (condition V)
1000–1150
MPa
Hardness (condition V)
293–352
HB
Mechanical Properties
Check the key mechanical properties and performance requirements of EN19 Round Bar
The values shown are BS 970 tensile and hardness ranges for EN19 in the hardened and tempered conditions R to V. Each EN19 condition is limited to a ruling section, and its yield, elongation and impact minimums change with condition and size.
Condition T (850–1000 MPa, 248–302 HB) is the most common supply condition and gives a good mix of strength, toughness and machinability. Higher conditions give more strength but less ductility.
For design, use the values for the ordered condition and section size, and confirm results on the mill certificate. BS 970 gives EN19 tensile ranges rather than simple minimums, so both under-strength and over-strength bar can be rejected. Condition T means 850–1000 MPa tensile strength and about 248–302 HB. Condition R (700–850 MPa) suits parts that need maximum toughness or easy machining, while conditions U and V give higher strength in smaller sections. Yield strength, elongation and Izod or Charpy impact minimums also apply to each condition and ruling section, and they should be read from the standard or the mill certificate. For shafts, fatigue strength follows tensile strength, so the condition should be chosen from the design stress.
Dimension / Sizes for Alloy Steel EN19 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 EN19 Round Bar
Pricing for Alloy Steel EN19 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 EN19 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 EN19 or EN24?
What does EN19T mean?
Is EN19 the same as 42CrMo4 and AISI 4140?
Can EN19 be nitrided?
How is EN19 heat treated, welded and machined?
What are the limits of EN19?
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