17-4PH 630 Stainless Steel Bar

Saky Steel's 17-4PH / 630 / 1.4542 is one of the most popular and most commonly used stainless chromium-nickel alloy steels with copper additive, precipitation hardened with martensitic structure. It is characterized by high corrosion resistance while maintaining high strength properties, including hardness. Steel can operate in the temperature range from -29 ℃ to 343 ℃, while retaining relatively good parameters. In addition, the materials in this grade are characterized by relatively good ductility and their corrosion resistance is comparable to 1.4301 / X5CrNi18-10.  

Specifications of 630 stainless steel bar:

Specifications : ASTM A564 /ASME SA564 Grade: AISI 630 SUS630 17-4PH 1.4542 PH Length :5.8M,6M & Required Length Round Bar Diameter : 4.00 mm to 400 mm Bright Bar : 4mm – 100mm, Tolerance : H8, H9, H10, H11, H12, H13, K9, K10, K11, K12 or as per clients’ requirements Condition : Cold Drawn & Polished Cold Drawn, Peeled & Forged Surface Finish : Black, Bright, Polished, Rough Turned, NO.4 Finish, Matt Finish Form : Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forged Etc. End : Plain End, Beveled End  

Stainless Steel Bar Grades Chemical Composition:

UNS Designation	Type	C	Mn	P	S	Si	Cr	Ni	Al	Mo	Ti	Cu	Other Elements
S17400	630	0.07	1.00	0.040	0.030	1.00	15.00–17.50	3.00–5.00	–	–	–	3.00–5.00	C
S17700	631	0.09	1.00	0.040	0.030	1.00	16.00–18.00	6.50–7.75	–	–	–	–	–
S15700	632	0.09	1.00	0.040	0.030	1.00	14.00–16.00	6.50–7.75	–	2.00–3.00	–	–	–
S35500	634	0.10–0.15	0.50–1.25	0.040	0.030	0.50	15.00–16.00	4.00–5.00	–	2.50–3.25	–	–	D
S17600	635	0.08	1.00	0.040	0.030	1.00	16.00–17.50	6.00–7.50	0.40	–	–	–	–
S15500	XM-12	0.07	1.00	0.040	0.030	1.00	14.00–15.50	3.50–5.50	–	–	–	2.50–4.50	C
S13800	XM-13	0.05	0.20	0.040	0.008	1.00	12.25–13.25	7.50–8.50	0.90–1.35	2.00–2.50	–	–	E
S45500	XM-16	0.03	0.50	0.015	0.015	0.50	11.00–12.50	7.50–9.50	–	0.50	0.90–1.40	1.50–2.50	F
S45503	–	0.010	0.50	0.010	0.010	0.50	11.00–12.50	7.50–9.50	–	0.50	1.00–1.35	1.50–2.50	F
S45000	XM-25	0.05	1.00	0.030	0.030	0.50	14.00–16.00	5.00–7.00	–	–	–	1.25–1.75	G
S46500	–	0.02	0.25	0.040	0.030	1.00	11.00–13.0	10.75–11.25	0.15–0.50	0.75–1.25	–	–	E
S46910	–	0.030	1.00	0.040	0.020	1.00	11.00–12.50	8.00–10.00	0.50–1.20	3.0–5.0	–	1.5–3.5	–
S10120	–	0.02	1.00	0.040	0.015	0.25	11.00–12.50	9.00–11.00	1.10	1.75–2.25	0.20–0.50	–	E
S11100	–	0.02	0.25	0.040	0.010	0.25	11.00–12.50	10.25–11.25	1.35–1.75	1.75–2.25	0.20–0.50	–	E

 

17-4PH Stainless Steel Bar Equivalent Grades:

STANDARD	UNS	WERKSTOFF NR.	AFNOR	JIS	EN	BS	GOST
17-4PH	S17400	1.4542

17-4PH Stainless Bar Solution Treatment:

Reamark: Condition A 1900±25°F[1040±15°C](cool as required to below 90°F(30°C))

1.4542 Mechanical Test Requirements After Age Hardening Heat Treatment:

Tensile Strength : Unit – ksi (MPa) , Minimum Yeild Strength : 0.2 % Offset , Unit – ksi (MPa) , Minimum Elongation : in 2″, Unit : % , Minimum Hardness : Rockwell , Maximum  

17-4PH Stainless Steel Mechanical Properties by Heat Treatment Condition：

	H 900	H 925	H 1025	H 1075	H 1100	H 1150	H 1150-M
Ultimate Tensile Strength, ksi	190	170	155	145	140	135	115
0.2% Yield Strength, ksi	170	155	145	125	115	105	75
Elongation % in 2" or 4XD	10	10	12	13	14	16	16
Reduction of Area, %	40	54	56	58	58	60	68
Hardness, Brinell (Rockwell)	388 (C 40)	375 (C 38)	331 (C 35)	311 (C 32)	302 (C 31)	277 (C 28)	255 (C 24)
Impact Charpy V-Notch, ft – lbs		6.8	20	27	34	41	75

 

Smelting Option:

1 EAF: Electric Arc Furnace 2 EAF+LF+VD: Refined-smelting and vacuum degassing 3 EAF+ESR: Electro Slag Remelting 4 EAF+PESR: protective atmosphere Electro Slag Remelting 5 VIM+PESR: Vacuum induction melting

Heat-treatment Option:

1 +A: Annealed (full/soft/spheroidizing) 2 +N: Normalized 3 +NT: Normalized and tempered 4 +QT: Quenched and tempered (water/oil) 5 +AT: Solution annealed 6 +P: Precipitation hardened  

Heat Treatment:

Solution treatment (Condition A) — Grade 630 stainless steels are heated at 1040°C for 0.5 h, then air-cooled to 30°C. Small sections of these grades can be oil quenched. Hardening — Grade 630 stainless steels are age-hardened at low temperatures to achieve the required mechanical properties. During the process, superficial discoloration occurs followed by shrinkage at 0.10% for condition H1150, and 0.05% for condition H900.    

Standards for 17-4PH Stainless Steel

17-4PH stainless steel conforms to a wide range of international standards and specifications, ensuring reliable quality and performance across industries such as aerospace, energy, and chemical processing.  

In-Site Test Items Applicable for Bars:

To ensure the highest quality and performance, all SAKY STEEL bar products can be tested through a comprehensive range of in-site inspections. These tests verify chemical composition, mechanical integrity, and microstructural stability directly on materials before shipment or after processing.

No.	Test Item	Description	Applicable Materials / Range	Note
1	In-situ Hardness Test	Measures surface hardness (HB/HRC/HV) to verify heat treatment or forging condition	All bar types — stainless steel, nickel alloys, titanium, aluminum	Standard test for bars
2	In-situ Metallographic Test	Examines grain structure, carbide distribution, and phase ratio	Stainless steel, nickel alloy, titanium	Detects overheating or improper heat treatment
3	In-situ Chemical Composition Test (PMI)	Confirms material grade and chemical composition using XRF or OES	All metallic bars	Prevents material mix-up
4	Residual Stress Test	Evaluates internal stress after heat treatment or machining	Steel, nickel, titanium bars	Prevents deformation or cracking
5	Stress and Strain Test	Determines mechanical properties such as yield strength and modulus	Structural or high-strength bars	Optional mechanical verification
6	Non-destructive Test of Ferrite Number	Measures FN value and ferrite-austenite balance	Austenitic / Duplex stainless steel bars	Not applicable for aluminum or titanium
7	Thickness Test of Coatings	Measures coating or anodized layer thickness	Plated, coated, or anodized bars	For special surface-treated bars only
8	In-situ Simulated Corrosion Test	Evaluates corrosion resistance per NACE or custom spec	Stainless steel, nickel alloy bars	Used in marine or chemical projects
9	Ultrasonic Flaw Detection (UT)	Detects internal defects and inclusions in solid bars	All metallic solid bars	Replaces wall-thickness test (for tubes only)

 

Chemical Composition Analysis

At SAKY STEEL, we ensure every batch of material meets the  international standards through comprehensive chemical composition analysis. Our advanced laboratory is equipped with state-of-the-art instruments, including Optical Emission Spectrometer (OES), Positive Material Identification (PMI) device, Inductively Coupled Plasma Spectrometer (ICP), and X-Ray Fluorescence (XRF) analyzer.

Method (Abbreviation)	Full English Name / Description	Typical Purpose
OES	Optical Emission Spectrometric Analysis	Rapid alloy composition testing
PMI	Positive Material Identification	On-site material grade verification
ICP	Inductively Coupled Plasma Spectrometric	Precise trace element analysis
XRF	X-Radial Fluorescence Spectrometric	Multi-element analysis for metal and alloy samples
Carbon & Sulfur Analyse	Carbon and Sulfur Analyzer	Determination of C and S content in steels
N/O/H Analyse	Nitrogen, Oxygen, and Hydrogen Analyzer	Gas element detection in metals
Chemical Titration	Classical Wet Chemistry Method	Standard chemical verification
Spectrophotometer	UV-Visible Spectrophotometric Analysis	Trace element colorimetric testing
FAAS	Flame Atomic Absorption Spectroscopy	Quantitative element measurement
GC	Gas Chromatography	Separation and analysis of gases or volatile compounds
IC	Ion Chromatography	Analysis of anions and cations in solutions
GD-MS	Glow Discharge Mass Spectrometry	Depth profiling and surface analysis
TOC Analyzer	Total Organic Carbon Analyzer	Organic content testing
IR Spectrometer	Infrared Spectrometry	Molecular structure and compound identification

 

Mechanical Performance Testing:

At SAKY STEEL, we conduct a full range of mechanical performance tests to ensure the strength, toughness, and durability of every stainless steel, alloy steel, and nickel alloy product we deliver.We perform comprehensive tests such as tensile strength, yield strength, elongation, hardness (Brinell, Rockwell, Vickers, Leeb), bending, impact toughness, fatigue, and fracture toughness (KIC and CTOD). These tests precisely measure the mechanical behavior of materials under various loads and environments, ensuring full compliance with ASTM, EN, GB, and ISO standards. 

Test Item	Full Name / Description
Brinell / Rockwell / Vickers hardness test	Hardness measurement for different metal types
Knoop / Leeb / Webster hardness test	Portable and micro hardness testing
Shore / Mohs / Pencil hardness test	Surface hardness assessment
Nano indentation test	Micro/nano mechanical property analysis
Room / high temperature tensile test	Tensile strength testing at ambient or elevated temperatures
Elastic modulus / Poisson’s ratio test	Elastic deformation characteristics
Tensile strain hardening exponent (n) test	Material strain-hardening behavior
Plastic strain ratio (r) test	Plastic deformation property
Bend test	Ductility and formability testing
Reverse bend test	Fatigue and flexibility assessment
Flaring / flanging / flattening test	Tube and pipe forming performance evaluation
Low / room temperature impact test	Impact toughness testing under various conditions
Temper brittleness assessment	Evaluation of temper embrittlement
Fracture toughness test (KIC test)	Crack resistance under stress
Shear test	Shear strength measurement
Fatigue test	Durability under cyclic loading
Endurance creep test	Long-term deformation resistance
Crack Tip Opening Displacement (CTOD) test	Fracture mechanics and crack propagation analysis
Non-standard mechanical test	Customized testing based on client requirements

 

Why Choose Us :

1. You can get the perfect material according to your requirement at the least possible price. 2. We also offer Reworks, FOB, CFR, CIF, and door to door delivery prices. We suggest you to do deal for shipping which will be quite economical. 3. The materials we provide are completely verifiable, right from raw material test certificate to the final dimensional statement.(Reports will show on requirement) 4. e guarantee to give a response within 24hours(usually in the same hour) 5. You can get stock alternatives, mill deliveries with minimizing manufacturing time. 6. We are fully dedicated to our customers. If it will not possible to meet your requirements after examining all options, we will not mislead you by making false promises which will create good customer relations.

Packaging

1. Packing is quite important especially in a case of international shipments in which consignment pass through various channels to reach the ultimate destination, so we put special concern regarding packaging. 2. Saky Steel's pack our goods in numerous ways based on the products. We pack our products in multiple ways, such as, Applications: 17-4PH, 630 and X5CrNiCuNb16-4 / 1.4542 is provided in the form of round bars, sheets, flat bars and cold-rolled strip. The material is widely used in the aerospace, marine, paper, energy, offshore and food industries for heavy-duty machine components, bushings, turbine blades, couplings, screws, drive shafts, nuts, measuring devices.

1. Aerospace Industry

• Turbine engine components (impellers, shafts, housings)

• Landing gear parts

• Fasteners (bolts, nuts) and structural connectors

• Hydraulic system components

2. Oil and Gas Industry

• Downhole tools (drill rods, valve seats, pipe fittings)

• Corrosion-resistant valve parts

• Oilfield equipment components (pump shafts, housings, sealing rings)

3. Chemical Processing Industry

• Pumps and valves used in acidic environments

• Heat exchangers and pressure vessels

• Reactors and agitator shafts

• Fittings for storage tanks

4. Food Processing & Medical Equipment

• Food-grade molds and drive components

• Components for high-pressure sterilizers

• Surgical tools and medical instruments (certification required)

• Parts for medical pressure control systems

5. Marine and Offshore Engineering

• Propeller shafts and propulsion assemblies

• Seawater pump shafts and sealing components

• Fasteners and structural connectors in ship hulls

• Corrosion-resistant components for offshore platforms

6. Nuclear and Power Generation

• Fasteners for nuclear reactor structures

• Tube bundle supports for heat exchangers

• Hydraulic valve rods and pump bodies

• High-temperature valve parts

7. Mold and Tooling Industry

• Injection mold frames

• High-strength forming shafts and supports

• Guide posts and bushings for stamping molds

8. General Machinery & Automation

• Transmission components such as gear shafts, couplings, and spindles

• Mechanical rails and positioning rods in automation systems

• Industrial hydraulic piston rods