Alloy Steel F11 Round Bar
➡️ F11 | UNS K11572 | EN 1.7335
➡️ 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:
K11572
Wr. No.:
1.7335
MTC Available:
EN 10204 3.1
Product Description for Alloy Steel F11 Round Bar
F11 is the ASTM A182 grade designation for a 1.25% chromium, 0.5% molybdenum low-alloy steel with a deliberate silicon addition, UNS K11572. Bar ships to ASTM A182 / A182M with dimensions to ASTM A29 / A29M. The same alloy is P11 in ASTM A335 pipe and Grade 11 in ASTM A387 plate.
This is one of the workhorse chromium-molybdenum grades of refinery and power plant construction. At 1.00-1.50% chromium it offers moderate oxidation resistance and useful creep strength to around 550 C, at a cost well below the higher chromium grades. It is not stainless and will rust in wet service.
ASTM A182 divides F11 into Classes 1, 2 and 3, distinguished by tempering treatment and the resulting strength level. Class 1 is the softest at 415 MPa minimum tensile, Class 2 sits at 485 MPa, and Class 3 at 515 MPa. Each carries its own mandatory hardness range, and the classes are not interchangeable, so the class must be on the order.
Bar is supplied annealed, or normalised and tempered, with the tempering temperature set by class.
Stock covers 10 mm to 300 mm, hot-finished or cold-finished. The steel is ferromagnetic and machines readily, particularly in the softer Class 1 condition.
All three classes share the same composition, so a certificate showing correct chemistry proves nothing about which class you have. Only the tensile and hardness results identify it.
Typical work is heater and boiler hardware, valve and flange stock, hot bolting, pressure-vessel components and general elevated-temperature piping parts.
Common Applications of Alloy Steel F11 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 F11 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS K11572
ASTM A182 / A182M
USA
Grade F11 Classes 1, 2 and 3
ASTM A335 / A335M
USA
Grade P11 (seamless pipe)
ASTM A387 / A387M
USA
Grade 11 (plate)
EN 10216-2
Europe / EU
13CrMo4-5 (1.7335)
DIN 17175
Europe / EU
1.7335 (13CrMo4-5)
Technical Specification for Alloy Steel F11 Round Bar
Specification
Value
Unit
Material
Alloy steel
-
Grade
F11 / UNS K11572 / 1.7335 nearest
-
Product Form
Round bar / rod
-
Standard
ASTM A182 / A182M Grade F11, Classes 1, 2 and 3
-
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, or normalised and tempered, tempering temperature set by class
-
Tolerance Standard
ASTM A29 / A29M
-
Density
7.80 (typical)
g/cm3
Melting Range
1425 - 1510 (typical)
C
Thermal Conductivity at 100 C
38.0 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
12.6 (typical)
um/m.C
Specific Heat (0-100 C)
460 (typical)
J/kg.K
Electrical Resistivity at 20 C
0.23 (typical)
uOhm.m
Modulus of Elasticity at 20 C
205 (typical)
GPa
Magnetic Properties
Ferromagnetic in all conditions
-
Maximum Service Temperature
550 (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 F11 Round Bar
Specify ASTM A182 / A182M as Grade F11, with dimensional requirements from ASTM A29 / A29M rather than the stainless standard A484.
The class system is the thing to get right. Class 1 is tempered highest and comes out softest, at 415 MPa minimum tensile with a 121-174 HBW hardness range. Class 2 gives 485 MPa minimum tensile with 143-207 HBW. Class 3 gives 515 MPa minimum tensile with 156-207 HBW. All three share the same composition, so a certificate showing correct chemistry proves nothing about which class you have. The hardness result and the tensile result are what identify it, and the class must appear on the purchase order.
Class 1 is usually chosen where machinability and toughness matter more than strength, Class 2 for general service, and Class 3 where higher strength is needed.
Welding requires preheat, typically 150-250 C, with post-weld heat treatment below the tempering temperature. At 1.25% chromium the hardenability is lower than F5 or F9, so the requirements are less severe, but they are still requirements rather than suggestions.
For elevated-temperature design, creep-rupture data and ASME allowable stresses govern above about 400 C, and the practical ceiling is around 550 C.
Chemical Composition for Alloy Steel F11 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
0.05
0.15
%
Manganese
Mn
0.30
0.60
%
Silicon
Si
0.50
1.00
%
Phosphorus
P
-
0.030
%
Sulfur
S
-
0.030
%
Chromium
Cr
1.00
1.50
%
Molybdenum
Mo
0.44
0.65
%
Iron
Fe
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy Steel F11 Round Bar
Chromium at 1.00-1.50% gives moderate oxidation resistance and a modest improvement in sulphidic corrosion resistance over plain carbon steel. More importantly it works with molybdenum to form the stable alloy carbides that carry creep strength. At this level the steel is emphatically not stainless and will rust in wet or humid conditions.
Molybdenum at 0.44-0.65% is the main creep-strengthening element. It strengthens the solid solution and forms carbides that resist coarsening under sustained load at temperature, which is what keeps the steel from deforming slowly over years of service.
Carbon is specified as a range of 0.05-0.15% rather than a simple maximum. The floor matters because carbon is needed to form those alloy carbides, and a heat at the bottom of the range will temper to a lower strength than one at the top.
Silicon at 0.50-1.00% carries a deliberate minimum, which is what distinguishes F11 from F12. It deoxidises and adds to oxidation resistance.
Manganese at 0.30-0.60% deoxidises and provides hardenability. Phosphorus and sulphur are each held to 0.030%, protecting creep ductility and limiting susceptibility to temper embrittlement during long service in the sensitive temperature range.
Mechanical Properties for Alloy Steel F11 Round Bar
Mechanical Property
Value
Unit
Tensile Strength, Class 1
415
MPa (minimum)
Tensile Strength, Class 2
485
MPa (minimum)
Tensile Strength, Class 3
515
MPa (minimum)
Yield Strength 0.2% Proof, Class 1
205
MPa (minimum)
Yield Strength 0.2% Proof, Class 2
275
MPa (minimum)
Yield Strength 0.2% Proof, Class 3
310
MPa (minimum)
Elongation in 50 mm
20
% (minimum, all classes)
Reduction of Area, Class 1
45
% (minimum)
Reduction of Area, Class 2
30
% (minimum)
Reduction of Area, Class 3
30
% (minimum)
Hardness, Class 1
121 - 174
HBW (specified range)
Hardness, Class 2
143 - 207
HBW (specified range)
Hardness, Class 3
156 - 207
HBW (specified range)
Modulus of Elasticity
205
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy Steel F11 Round Bar
The table carries ASTM A182 / A182M requirements for Grade F11, tested to ASTM A370. Because the standard defines three classes, every strength and hardness figure is shown against its class rather than merged into a single set. All three classes share the same composition, so chemistry alone cannot tell them apart.
Class 1 is the softest and toughest, at 415 MPa tensile minimum alongside 205 MPa minimum proof strength, with a 121-174 HBW hardness range. It is chosen where machinability, formability and toughness matter more than strength.
Class 2 is the general-purpose choice at 485 MPa minimum tensile and 275 MPa minimum proof strength, with 143-207 HBW.
Class 3 is the strongest at 515 MPa minimum tensile and 310 MPa minimum proof strength, with 156-207 HBW.
Reduction of area requirements also differ by class, with Class 1 requiring more than Classes 2 and 3, reflecting its softer, tougher condition.
Each hardness band is mandatory at both ends. A result below the floor indicates over-tempering with compromised creep strength, and a result above the ceiling indicates insufficient tempering. Above about 400 C, creep-rupture data and ASME allowable stresses replace these figures as the design basis.
Dimension / Sizes for Alloy Steel F11 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 F11 Round Bar
Pricing for Alloy Steel F11 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 F11 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
What is Alloy Steel F11 Round Bar?
What are Classes 1, 2 and 3 in Grade F11?
What standard does Alloy Steel F11 Round Bar comply with?
What is the difference between F11 and F12?
What are the key mechanical properties of Alloy Steel F11 Round Bar?
Is Alloy Steel F11 stainless?
Can Alloy Steel F11 Round Bar be welded?
What sizes and lengths are available?
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