Stainless Steel 430F Round Bar
➡️ SS 430F | UNS S43020 | EN 1.4104
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Stainless Steel
UNS Number:
S43020
Wr. No.:
1.4104
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 430F Round Bar
Type 430F (UNS S43020) is the free-machining version of ferritic Type 430, and bar is supplied to ASTM A582 / A582M, the standard covering free-machining stainless steel bars. Dimensional and surface requirements follow ASTM A484 / A484M, and European practice specifies the grade as 1.4104 to EN 10088-3.
The composition is 16-18% chromium with a deliberate sulphur addition of 0.15% minimum. That sulphur forms manganese sulphide inclusions which break the chip during cutting, and it is why the grade machines far faster and with better surface finish and tool life than standard 430. Some producers add up to 0.60% molybdenum, which the standard permits.
The trade is corrosion resistance. Sulphide inclusions are sites where pitting starts, so 430F is meaningfully less corrosion resistant than plain 430 and is not a marine or chemical grade. It suits mildly corrosive and indoor atmospheric service.
Bar is supplied annealed at roughly 760-830 C. It is ferritic, so it stays magnetic in every condition and will not respond to hardening heat treatment. Weldability is poor because of the sulphur, and welded construction is normally avoided.
Sizes span 6 mm to 150 mm, mostly cold-finished by drawing, turning or centreless grinding for the close tolerances that automatic machining demands. Demand concentrates in the smaller sizes, since that is where automatic lathe work sits.
Where free machining is wanted with better corrosion resistance, austenitic grade 303 is the usual alternative, though it is non-magnetic and behaves quite differently under the tool.
The usual work is high-volume turned parts: shafts, spindles, nozzles, valve components, fittings, fasteners, solenoid and instrument parts.
Common Applications of Stainless Steel 430F 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 SS 430F Round Bar
Standard
Country / Region
Grade
ASTM A582 / A582M
USA
Type 430F (UNS S43020)
EN 10088-3
Europe / EU
1.4104 (X14CrMoS17)
BS EN 10088-3
United Kingdom
1.4104
JIS G4303
Japan
SUS 430F
KS D 3706
South Korea
STS 430F
ISO 15510
International
X14CrMoS17
Technical Specification for Stainless Steel 430F Round Bar
Specification
Value
Unit
Material
Stainless steel
-
Grade
430F / UNS S43020 / 1.4104
-
Product Form
Round bar / rod
-
Standard
ASTM A582 / A582M
-
Diameter
6 - 150 (typical supply range)
mm
Length
3 - 6 (random), or cut to length
m
Manufacturing Process
Hot rolled, annealed, generally cold finished
-
Production Route
EAF + AOD refining with controlled sulphur addition
-
Surface Finish
Cold-drawn, peeled, turned, centreless ground, polished
-
Heat Treatment / Delivery Condition
Annealed 760-830 C, air or slow cooled
-
Tolerance Standard
ASTM A484 / A484M
-
Density
7.70 (typical)
g/cm3
Melting Range
1425 - 1510 (typical)
C
Thermal Conductivity at 100 C
26.1 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
10.4 (typical)
um/m.C
Specific Heat (0-100 C)
460 (typical)
J/kg.K
Electrical Resistivity at 20 C
0.60 (typical)
uOhm.m
Modulus of Elasticity at 20 C
200 (typical)
GPa
Magnetic Properties
Ferromagnetic in all conditions
-
Relative Machinability
Approximately 70 - 80 relative to AISI 1212 at 100 (typical)
%
Testing / Inspection Standard
ASTM A370 for mechanical testing
-
Certification / Inspection Documents
EN 10204 3.1 mill test certificate
-
Technical Specifications
Get the key technical specifications for Stainless Steel 430F Round Bar
Order to ASTM A582 / A582M, which covers free-machining stainless steel bars and sets composition and condition for Type 430F. Size tolerance, straightness and finish are governed by ASTM A484 / A484M. European supply is to EN 10088-3 as 1.4104 (X14CrMoS17).
The delivery condition is annealed, normally 760-830 C followed by air or slow cooling. Being ferritic, the grade does not transform on cooling, so quench hardening achieves nothing and cold work is the only route to higher strength.
Most 430F is supplied cold-finished, because the whole point of the grade is automatic machining and that requires the close diameter tolerance and consistent surface a drawn, turned or ground bar provides. Cold-finished bar also machines more predictably than hot-rolled.
Two limitations should be settled before specifying. Corrosion resistance is below that of plain 430, since the manganese sulphide inclusions that make the grade machinable are also preferential pitting sites, so it belongs in mild atmospheric and indoor service rather than marine or chemical duty. Weldability is poor for the same reason, and welded construction is normally avoided in favour of machined or mechanically assembled parts.
Where free machining is wanted with better corrosion resistance, the austenitic free-machining grade 303 is the usual alternative, though it is non-magnetic and behaves quite differently.
Chemical Composition for Stainless Steel 430F Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.12
%
Manganese
Mn
-
1.25
%
Silicon
Si
-
1.00
%
Phosphorus
P
-
0.060
%
Sulfur
S
0.15
-
%
Chromium
Cr
16.00
18.00
%
Iron
Fe
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for SS 430F Round Bar
Sulphur is the addition that defines the grade, and unusually it carries a minimum rather than a maximum: 0.15% at least. Sulphur combines with manganese to form manganese sulphide inclusions distributed through the steel. Those inclusions act as internal stress raisers during cutting, breaking the chip cleanly instead of letting it draw out into long strings, which is what delivers the faster cutting speeds, better surface finish and longer tool life the grade is bought for.
Chromium at 16.00-18.00% generates the passive skin and provides corrosion resistance in mild atmospheric conditions. It also keeps the structure ferritic across the whole temperature range, so the grade cannot be hardened by transformation.
Carbon is allowed up to 0.12%, higher than in modern low-carbon ferritics, and contributes some strength while limiting how far corrosion resistance can be pushed.
One point to watch on equivalents: ASTM A582 specifies no molybdenum for Type 430F, whereas the European grade 1.4104 (X14CrMoS17) carries a deliberate molybdenum addition. The two are close but not identical, so if molybdenum matters to your application, check the analysis rather than the grade name.
Manganese up to 1.25% is essential, since it is what ties up the sulphur as manganese sulphide. Silicon deoxidises, and phosphorus is a residual with a slightly relaxed limit of 0.060%, reflecting the free-machining nature of the grade.
Mechanical Properties for Stainless Steel 430F Round Bar
Mechanical Property
Value
Unit
Hardness, annealed condition
262
HB (maximum, per ASTM A582)
Tensile Strength, annealed
550
MPa (typical)
Yield Strength 0.2% Proof, annealed
380
MPa (typical)
Elongation in 50 mm, annealed
25
% (typical)
Reduction of Area, annealed
50
% (typical)
Modulus of Elasticity
200
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 430F Round Bar
ASTM A582 / A582M controls free-machining stainless bars principally through composition and hardness rather than through a full set of mandatory tensile minima, because these grades are bought for machinability and the finished part is almost always machined from the bar. The annealed hardness ceiling is the figure that gets verified. The tensile, proof strength, elongation and reduction of area values shown here are typical for annealed 430F and should be treated as indicative rather than as guaranteed acceptance limits.
Being ferritic, the grade cannot be hardened by quenching and tempering. Annealing at 760-830 C softens it and restores what ductility it has, and cold drawing is the only way to raise strength, at the usual cost in elongation.
Room-temperature impact toughness is low and falls further below ambient, because ferritic steels have a ductile-to-brittle transition. The sulphide inclusions make this worse by acting as crack initiation sites, and they also reduce transverse ductility noticeably compared with longitudinal. Neither ASTM A582 nor normal practice imposes a Charpy requirement.
None of this matters much in the applications the grade actually serves, which are small machined components under modest static load.
Dimension / Sizes for Stainless Steel 430F Round Bar
Dimension / Size
Value
Unit
Diameter
6 - 150
mm
Standard Length
3 - 6 (random / mill lengths)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM A484 / A484M, varies with size and finish class
-
Length Tolerance
Per ASTM A484 / A484M or as agreed at order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed at order
-
End Condition
Square cut, chamfered, or as ordered
-
Surface Finish
Cold-drawn, peeled, turned, centreless ground, polished
-
Available Size Range
6 - 150, larger diameters subject to enquiry
mm
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM A484 / A484M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 430F Round Bar
Pricing for Stainless Steel 430F 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 Stainless Steel 430F 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 Stainless Steel 430F Round Bar?
Why does 430F machine better than 430?
What standard does Stainless Steel 430F Round Bar comply with?
What are the equivalent grades of Stainless Steel 430F Round Bar?
Is 430F as corrosion resistant as 430?
Is Stainless Steel 430F magnetic?
Can Stainless Steel 430F Round Bar be welded?
What sizes and lengths are available?
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