Alloy Steel F5 Round Bar
➡️ F5 | UNS K41545 | EN 1.7362
➡️ 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:
K41545
Wr. No.:
1.7362
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel F5 Round Bar
F5 is the ASTM A182 grade designation for a 5% chromium, 0.5% molybdenum low-alloy steel, UNS K41545. Stock is supplied to ASTM A182 / A182M with dimensional requirements to ASTM A29 / A29M, the general standard for carbon and alloy steel bars. The same alloy appears as P5 in ASTM A335 seamless pipe and Grade 5 in ASTM A387 plate.
This is a chromium-molybdenum creep-resisting steel rather than a stainless one. At 4-6% chromium it has useful resistance to oxidation and to sulphidic corrosion in hot hydrocarbon streams, but it will rust in wet service and is not a substitute for stainless in aqueous conditions.
The molybdenum addition of 0.44-0.65% is what provides creep strength, and the grade is used continuously to around 650 C in refinery heater and piping service.
Bar is supplied annealed, or normalised and tempered, with tempering at 675 C minimum. Hardness is controlled to a 143-217 HBW range, and unlike the ceilings applied to stainless grades this is a mandatory band with both a floor and a limit.
Sizes run 10 mm to 300 mm, hot-finished or cold-finished. The steel is ferromagnetic and readily machinable in the supplied condition, particularly when ordered annealed.
Welding needs preheat of roughly 200-300 C with a maintained interpass temperature and post-weld heat treatment below the tempering temperature, since a 5% chromium steel air hardens and will crack if welded cold.
Typical work is refinery heater components, hydrocarbon piping hardware, valve bodies and stems, flange and fitting stock, and bolting for elevated-temperature service.
Common Applications of Alloy Steel F5 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 Alloy Steel F5 Round Bar
Standard
Country / Region
Grade
ASTM A182 / A182M
USA
Grade F5 (UNS K41545)
ASTM A335 / A335M
USA
Grade P5 (seamless pipe)
ASTM A387 / A387M
USA
Grade 5 (plate)
EN 10216-2
Europe / EU
X11CrMo5 (1.7362)
DIN 17175
Europe / EU
1.7362 (X11CrMo5)
Technical Specification for Alloy Steel F5 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
F5 / UNS K41545 / 1.7362
-
Product Form
Round bar / rod
-
Standard
ASTM A182 / A182M Grade F5
-
Diameter
10 - 300 (typical supply range)
mm
Length
3 - 6 (random), or cut to length
m
Manufacturing Process
Hot rolled or forged, annealed or normalised and tempered
-
Production Route
EAF or BOF with ladle refining, continuous cast or ingot
-
Surface Finish
Hot-rolled, rough-turned, peeled, smooth-turned, centreless ground
-
Heat Treatment / Delivery Condition
Annealed at 955 C furnace cooled, or normalised at 955 C and tempered at 675 C minimum
-
Tolerance Standard
ASTM A29 / A29M
-
Density
7.78 (typical)
g/cm3
Melting Range
1425 - 1510 (typical)
C
Thermal Conductivity at 100 C
34.0 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
12.5 (typical)
um/m.C
Specific Heat (0-100 C)
460 (typical)
J/kg.K
Electrical Resistivity at 20 C
0.40 (typical)
uOhm.m
Modulus of Elasticity at 20 C
200 (typical)
GPa
Magnetic Properties
Ferromagnetic in all conditions
-
Maximum Service Temperature
650 (typical, continuous)
C
Testing / Inspection Standard
ASTM A370 for mechanical testing, ASTM A182 for hardness verification
-
Certification / Inspection Documents
EN 10204 3.1 or 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Alloy Steel F5 Round Bar
Order to ASTM A182 / A182M as Grade F5. Dimensional tolerance, straightness and surface condition come from ASTM A29 / A29M, the general requirements standard for carbon and alloy steel bars, not from ASTM A484 which applies to stainless.
Two delivery conditions are permitted. Annealed material is softer and easier to machine. Normalised and tempered material gives better toughness and a more uniform structure through heavy sections, and tempering must be carried out at 675 C minimum after normalising from 955 C. State which you want, because they machine differently.
Hardness is specified as a 143-217 HBW range rather than a maximum, and that distinction matters. The floor confirms the material was not over-tempered into a soft condition with inadequate creep strength, and the ceiling confirms it was tempered enough to be tough and machinable. Material outside the band is rejectable either way.
Welding requires preheat, typically 200-300 C, with an interpass temperature maintained and post-weld heat treatment carried out below the tempering temperature. Skipping preheat on a 5% chromium steel risks hydrogen cracking.
For hot hydrocarbon service the grade resists sulphidic corrosion reasonably well, and its performance is usually assessed against modified McConomy or Couper-Gorman data rather than from the composition alone.
Chemical Composition for Alloy Steel F5 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.15
%
Manganese
Mn
0.30
0.60
%
Silicon
Si
-
0.50
%
Phosphorus
P
-
0.030
%
Sulfur
S
-
0.030
%
Chromium
Cr
4.00
6.00
%
Molybdenum
Mo
0.44
0.65
%
Nickel
Ni
-
0.50
%
Iron
Fe
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy Steel F5 Round Bar
Chromium at 4.00-6.00% does two jobs that both matter in refinery service. It forms a protective oxide that resists scaling to around 650 C, and it substantially improves resistance to sulphidic corrosion in hot hydrocarbon streams, which is the mechanism that eats plain carbon steel in crude and vacuum unit piping. What it does not do at this level is make the steel stainless, so the material will rust in wet or aqueous conditions.
Molybdenum at 0.44-0.65% supplies the creep strength. It strengthens the solid solution and forms fine carbides that resist coarsening during long exposure at temperature, slowing the diffusion processes that cause a steel to sag and eventually rupture under sustained load.
Carbon is capped at 0.15%. Enough to give strength through carbide formation, low enough to keep the steel weldable with preheat rather than unweldable.
Manganese at 0.30-0.60% deoxidises and adds hardenability. Silicon up to 0.50% deoxidises and makes a small contribution to oxidation resistance.
Nickel is limited to 0.50% as a residual rather than added deliberately. Phosphorus and sulphur are each held to 0.030%, tighter than plain structural steel, to protect creep ductility and resistance to temper embrittlement.
Mechanical Properties for Alloy Steel F5 Round Bar
Mechanical Property
Value
Unit
Tensile Strength
485
MPa (minimum)
Yield Strength 0.2% Proof
275
MPa (minimum)
Elongation in 50 mm
20
% (minimum)
Reduction of Area
35
% (minimum)
Hardness
143 - 217
HBW (specified range, mandatory)
Modulus of Elasticity
200
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy Steel F5 Round Bar
ASTM A182 / A182M sets these for Grade F5, tested to ASTM A370. Tensile, proof strength, elongation and reduction of area are minima. Hardness is a specified range with both a floor and a ceiling, and this is where alloy steel grades differ from the stainless grades covered by ASTM A276 and A479, where hardness is normally only a maximum.
The floor of 143 HBW matters as much as the 217 HBW limit. Material below it has been over-tempered, which means the carbide structure has coarsened and the creep strength the grade exists to provide has been compromised, even though tensile testing at room temperature might still pass. Material above the ceiling has not been tempered enough and will be harder to machine and lower in toughness.
Room-temperature strength is modest and is not why anyone specifies F5. The grade is chosen for what it does above 400 C, where design has to run on creep-rupture and allowable stress data from ASME BPVC rather than on the tensile figures shown here.
No mandatory Charpy requirement applies under A182 for this grade, but impact testing at the design temperature is commonly added as a supplementary requirement for low-temperature or heavy-section work.
Dimension / Sizes for Alloy Steel F5 Round Bar
Dimension / Size
Value
Unit
Diameter
10 - 300
mm
Standard Length
3 - 6 (random / mill lengths)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM A29 / A29M, varies with size and finish
-
Length Tolerance
Per ASTM A29 / A29M or as agreed at order
-
Straightness Tolerance
Per ASTM A29 / A29M or as agreed at order
-
End Condition
Square cut, chamfered, or as ordered
-
Surface Finish
Hot-rolled, rough-turned, peeled, smooth-turned, centreless ground
-
Available Size Range
10 - 300, larger diameters by forging on enquiry
mm
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM A29 / A29M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy Steel F5 Round Bar
Pricing for Alloy Steel F5 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
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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
What is Alloy Steel F5 Round Bar?
Is Alloy Steel F5 stainless?
What standard does Alloy Steel F5 Round Bar comply with?
What are the equivalent grades of Alloy Steel F5 Round Bar?
What are the key mechanical properties of Alloy Steel F5 Round Bar?
Why is hardness specified as a range rather than a maximum?
Can Alloy Steel F5 Round Bar be welded?
What sizes and lengths are available?
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