Stainless Steel 17-4 PH Round Bar
➡️ AISI 630 | UNS S17400 | EN 1.4542 | ASTM A564
➡️ 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:
S17400
Wr. No.:
1.4542
MTC Available:
EN 10204 3.1
Product Description for Stainless Steel 17-4 PH Round Bar
Grade 17-4 PH is designated UNS S17400 and W.Nr. 1.4542. As round bar it is normally ordered to ASTM A564 / A564M (Type 630), with ASTM A484 / A484M covering dimensional and surface requirements. EN, JIS, GB/T and KS all carry an equivalent designation.
The grade is a precipitation-hardening martensitic stainless steel containing 15-17.5% chromium, 3-5% nickel, 3-5% copper and niobium. Strengthening comes from fine copper-rich precipitates formed during a single low-temperature ageing treatment, which produces tensile strength up to approximately 1310 MPa with minimal distortion and corrosion resistance approaching that of grade 304.
Stock diameters run from 3 mm to 500 mm, with bigger sections forged against order, and lengths are either random 3 to 6 m or cut to a stated size. Bar is supplied in the solution annealed (Condition A) or precipitation hardened (H900 to H1150) condition, and can be hot finished, cold drawn, peeled, turned, ground or polished. Strength is developed by a low-temperature precipitation-hardening (ageing) treatment carried out after machining.
Typical parts are valve stems, pump shafts, fasteners, fittings and highly stressed machined parts, ordered by the aerospace, oil and gas, power generation, chemical processing and general engineering industries. Documentation is usually an EN 10204 3.1 certificate listing the heat analysis, the mechanical test results and the condition supplied. Third party inspection, positive material identification and non-destructive examination can be added at order stage. The melting range is roughly 1404 – 1440 C. The bar is ferromagnetic in every condition. Density is around 7.80 g/cm3 and the modulus of elasticity about 197 GPa.
Common Applications of Stainless Steel 17-4 PH 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 17-4 PH Round Bar
Standard
Country / Region
Grade
ASTM A564 / A564M (Type 630)
USA
UNS S17400 - Type 630 (17-4 PH)
ASME SA-564
USA
UNS S17400 - Type 630 (17-4 PH)
EN 10088-3
Europe / EU
1.4542 (X5CrNiCuNb16-4)
BS EN 10088-3
United Kingdom
1.4542 (X5CrNiCuNb16-4)
JIS G4303
Japan
SUS630
GB/T 1220
China
05Cr17Ni4Cu4Nb (S51740)
KS D 3706
South Korea
STS630
ISO 15510
International
X5CrNiCuNb16-4
Technical Specification for Stainless Steel 17-4 PH Round Bar
Specification
Value
Unit
Material
Stainless Steel
-
Grade
17-4 PH / UNS S17400 / W.Nr. 1.4542
-
Product Form
Round Bar / Rod
-
Standard
ASTM A564 / A564M (Type 630)
-
Diameter
3 - 500 (larger by forging on request)
mm
Length
3 - 6 (random mill length) or cut to length
m
Manufacturing Process
Hot rolled, forged or cold finished
-
Production Route
EAF + AOD / VOD refining, continuous cast or ingot, hot rolled or forged
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Heat Treatment / Delivery Condition
Solution annealed (condition a) or precipitation hardened (h900 to h1150)
-
Tolerance Standard
ASTM A484 / A484M
-
Carbon Equivalent (CEV)
Not applicable (CEV applies to carbon and low-alloy steels)
-
Density
7.80 (nominal)
g/cm3
Melting Range
1404 - 1440 (typical)
C
Thermal Conductivity at 100 C
17.9 (typical)
W/m.K
Coefficient of Thermal Expansion (0-100 C)
10.8 (typical)
10-6/K
Specific Heat (0-100 C)
460 (typical)
J/kg.K
Electrical Resistivity at 20 C
0.80 (typical)
micro-ohm.m
Modulus of Elasticity at 20 C
197 (typical)
GPa
Magnetic Properties
Ferromagnetic in all conditions
-
Applicable Testing / Inspection Standard
ASTM A370 (mechanical testing), ASTM E18 / E10 (hardness)
-
Certification / Inspection Documents
EN 10204 3.1 mill test certificate standard, 3.2 third-party, PMI, ultrasonic and dye-penetrant examination available on request
-
Technical Specifications
Get the key technical specifications for Stainless Steel 17-4 PH Round Bar
Buyers specify ASTM A564 / A564M (Type 630) for the material and ASTM A484 / A484M for dimensions and surface. In Europe the same steel is called 1.4542 (X5CrNiCuNb16-4). The ordered standard and condition should appear on the order and on the certificate.
Bar is supplied in Condition A, solution treated at approximately 1040 C and air cooled. Ageing is a single-step treatment, for example 480 C for one hour for H900 or 620 C for four hours for H1150, chosen to set the required strength and toughness combination.
Hot finished bar is rolled or forged, then heat treated and pickled. Cold finished bar is drawn, peeled, turned or ground after that. Diameter, out of round, straightness and length tolerances shift with size and finish class, so they are read from the dimensional standard or agreed case by case.
Because ageing is carried out at relatively low temperature, dimensional change during hardening is small, so parts can be machined close to final size in Condition A and aged afterwards with minimal distortion.
The physical properties quoted are typical mill values, not requirements of the standard. Testing is to ASTM A370, with results, analysis, condition and heat number on the certificate.
Chemical Composition for Stainless Steel 17-4 PH Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.07
%
Manganese
Mn
-
1.00
%
Silicon
Si
-
1.00
%
Phosphorus
P
-
0.040
%
Sulfur
S
-
0.030
%
Chromium
Cr
15.00
17.50
%
Nickel
Ni
3.00
5.00
%
Copper
Cu
3.00
5.00
%
Niobium + Tantalum
Nb + Ta
0.15
0.45
%
Chemical Composition
View the chemical composition and applicable material limits for SS 17-4 PH Round Bar
Copper at 3-5% is the hardening element. During ageing it forms nanoscale copper-rich precipitates that impede dislocation motion. Niobium stabilises carbon as niobium carbide, protecting chromium and preserving corrosion resistance, while nickel controls the martensitic transformation.
Chromium runs 15.00 to 17.50% here, and it is what makes the steel stainless: it builds the passive oxide film that resists attack. Nickel at 3.00 to 5.00% stabilises the structure and improves ductility and toughness. The standard also fixes copper 3.00 to 5.00%, niobium + tantalum 0.15 to 0.45%. Carbon is capped at 0.07%.
The manganese and silicon come from deoxidation and add slight strength. Phosphorus and sulphur are residual elements with low ceilings, because they cost hot workability, weldability and corrosion resistance.
ASTM, EN, JIS, GB/T and KS versions of the grade set slightly different limits. For general work the gap rarely matters; for severe corrosion or hot service it can, so check the heat analysis on the certificate against the standard ordered. Chemical analysis is carried out to ASTM A751. Where the composition table shows no limit for an element, the standard sets no requirement and the element need not be determined or reported.
Mechanical Properties for Stainless Steel 17-4 PH Round Bar
Mechanical Property
Value
Unit
Hardness (Condition A, solution annealed)
363 (max) / 38 HRC (max)
HBW
Tensile Strength (H900)
1310 (min)
MPa
Yield Strength 0.2% (H900)
1170 (min)
MPa
Elongation in 50 mm (H900, longitudinal)
10 (min)
%
Reduction of Area (H900, longitudinal)
40 (min)
%
Hardness (H900)
40 HRC / 388 HBW (min)
-
Tensile Strength (H1025)
1070 (min)
MPa
Yield Strength 0.2% (H1025)
1000 (min)
MPa
Elongation / Reduction of Area (H1025)
12 / 45 (min)
%
Tensile Strength (H1150)
930 (min)
MPa
Yield Strength 0.2% (H1150)
725 (min)
MPa
Elongation / Reduction of Area (H1150)
16 / 50 (min)
%
Charpy V-Notch Impact (H1150, ASTM A564 Table 3)
41 (min)
J
Modulus of Elasticity
197 (typical)
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of SS 17-4 PH Round Bar
Properties depend on the ageing condition. H900 gives 1310 MPa minimum tensile and 1170 MPa yield at 40 HRC; H1150 gives 930 MPa minimum tensile and 725 MPa yield with substantially higher toughness and improved stress corrosion resistance.
The ageing condition governs the result. Age low and strength and hardness go up; age higher and strength drops while toughness, ductility and stress corrosion resistance improve. Tensile testing is to ASTM A370 and hardness to ASTM E18, certified for the condition ordered, so the condition has to be specified.
For design, use the specified minima of the standard and condition ordered and take the real numbers from the mill certificate. Section size matters too, since diameter affects cooling rate during heat treatment and how much hot or cold work the bar has seen.
This combination of very high strength with useful corrosion resistance and low distortion during hardening is why the grade is selected for highly loaded aerospace, subsea and rotating machinery components. Fatigue performance is good, but notch sensitivity rises with strength level, so higher ageing temperatures are often specified where impact or stress corrosion resistance matters more than peak strength.
Dimension / Sizes for Stainless Steel 17-4 PH Round Bar
Dimension / Size
Value
Unit
Diameter (standard supply range)
3 - 500 (larger by forging on request)
mm
Standard Length
3 - 6 (random mill length)
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 on the order
-
Straightness Tolerance
Per ASTM A484 / A484M or as agreed on the order
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished and pickled, cold-drawn, peeled, turned, ground or polished
-
Available Size Range (cold-finished bar)
3 - 100 (typical commercial capability)
mm
Available Size Range (hot-finished and forged bar)
16 - 500 (typical commercial capability)
mm
Cut-to-Length Availability
Available, tolerance to be agreed at order stage
-
Applicable Dimensional Standard
ASTM A484 / A484M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for SS 17-4 PH Round Bar
Pricing for Stainless Steel 17-4 PH 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 17-4 PH 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 17-4 PH Round Bar?
What standard does Stainless Steel 17-4 PH Round Bar comply with?
What are the equivalent grades of Stainless Steel 17-4 PH Round Bar?
What sizes and lengths are available in Stainless Steel 17-4 PH Round Bar?
What are the key mechanical properties of Stainless Steel 17-4 PH Round Bar?
What is the typical chemical composition of Stainless Steel 17-4 PH Round Bar?
Can Stainless Steel 17-4 PH Round Bar be supplied cut to length or with a specific surface finish?
What do the H900 and H1150 conditions mean?
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