AISI 630 Hot Rolled Round Bar Age-Hardening Stainless Steel Bar in Warehouse Used in Oil and Gas Industry Condition or Precipitation Hardening Condition

• Customization: Available
• Type: Stainless Steel Bars
• Standard: ASTM, AISI, GB, JIS, DIN, EN, Technical Agreement
• Model NO.: UNS S17400/630/1.4542/17-4PH/0Cr17Ni4Cu4Nb/
• Grade: 600 Series
• Certification: ISO, Gjb
• Shape: Round
• Technique: Hot Rolled
• Surface Treatment: Bright
• Smelting Method: ESR-Electroslag Remelting
• Heat Treatment: Solution or Precipitation Hardening
• Surface: Turned / Polished to Bright
• Length: Limited or Random
• NDT: 100% Ut
• Transport Package: as Required
• Specification: φ5-80mm
• Trademark: SMTCO
• Origin: China
• HS Code: 7222110000
• Production Capacity: 10000t Per Year

Product Description

Product Description

Introduction

This martensitic precipitation-hardened stainless steel, enhanced with copper and niobium, builds upon the 0Cr15Ni5Cu4Nb base alloy and further optimizes its chemical composition and overall performance. Through the synergistic strengthening effects of copper and niobium, combined with precisely controlled heat treatment processes, this steel achieves a superior combination of mechanical properties compared to conventional martensitic stainless steels. It exhibits excellent tensile strength along with good ductility and toughness, making it an ideal choice for critical load-bearing structures. In terms of corrosion resistance, this steel significantly outperforms traditional martensitic stainless steels such as Cr13, 9Cr18, and 1Cr17Ni2. The synergistic effect of chromium, copper, and niobium endows it with enhanced resistance to pitting and crevice corrosion in chloride environments, particularly reaching its optimal corrosion resistance when aged at H1150. This steel also excels in corrosion fatigue performance; experimental data show that its corrosion fatigue limit is more than 30% higher than that of 12%Cr martensitic steels, and its resistance to water droplet erosion has been markedly improved as well. Regarding fabrication processes, this steel demonstrates excellent weldability and can be joined using conventional methods such as shielded metal arc welding and laser welding. After welding, its properties can be readily restored through simple post-weld heat treatment. It boasts outstanding forging characteristics, with a wide range of hot-working temperatures; however, its cold-forming capabilities are relatively limited. For parts with complex geometries, it is recommended to employ hot-forming processes.

Applications

In the aerospace industry, this material is widely used to manufacture critical load-bearing structural components of aircraft, including landing gear parts, engine mounting brackets, actuators for flight control systems, and high-strength fasteners for spacecraft. In the energy equipment sector, it is an ideal choice for gas turbine compressor blades, main pump shafts and valve components in nuclear power plants. In the petrochemical industry, it is primarily employed in critical equipment operating in highly corrosive environments—for example, valve bodies for deep-sea oil production trees, impellers and shaft sleeves for chemical process pumps. In the marine engineering field, it is commonly used to fabricate high-pressure pump components for seawater desalination units, hydraulic system components for submarines, and fastening and connecting elements for offshore platforms. Additionally, in the high-end equipment manufacturing sector, it can also be utilized in the production of precision molds, medical devices (such as orthopedic surgical instruments), and key components for defense industry products.

Equivalent Grades Standards

Steel Grade	Specification	Specification Name
0Cr17Ni4Cu4Nb / 05Cr17Ni4Cu4Nb / S51740	GB/T 1220	Stainless steel bars
	GB/T 1221	Heat-resistant steel bar
	GB/T 8732	Steels of blade for steam turbine
	GB/T 4238	Heat-resisting steel plate, sheet and strip
	GJB 8268	Specification for precipitation-hardening stainless steel bars for aviation
UNS S17400 / 630/1.4548/1.4542	ASTM A564/A564M	Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes
	ASTM A693	Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
	AMS 5604	16.5Cr-4.0Ni-4.0Cu-0.30Cb Aerospace material Specification-Steel, Corrosion Resistant, Sheet, Strip, and Plate 16.5Cr-4.0Ni-4.0Cu-0.30Cb Solution Heat Treated, Precipitation Hardenable
	AMS 5643	16Cr-4.0Ni-0.30Cb(Nb)-4.0Cu Aerospace material Specification-Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr-4.0Ni-0.30Cb(Nb)-4.0Cu Solution Heat Treated, Precipitation Hardenable
	AMS 5622	16Cr-4.0Ni-0.30Cb(Nb)-4.0Cu Aerospace material Specification-Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr-4.0Ni-0.30Cb(Nb)-4.0Cu Solution Heat Treated, Precipitation Hardenable Consumable Electrode Remelted
1.4542 / X5CrNiCuNb16-4	EN 10088-3	Stainless Steels Part 3-Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes
X5CrNiCuNb16-4	ISO 683-18	Stainless steels for general purposes – Part 1: Corrosion-resistant flat products
SUS630	JIS G 4303	Stainless Steel bars
	JIS G 4304	Hot rolled stainless steel sheet and strip
	JIS G 4305	Cold rolled stainless steel sheet and strip
	JIS G 4308	Stainless steel wire rods
Remark: Products produced as per other specifications or technical agreements (if need) are available.

Chemical composition

Elements	C	Si	Mn	P	S	Ni	Cr	Cu	Nb
Content%	≤0.07	≤1.00	≤1.00	≤0.040	≤0.030	3.00~5.00	15.00~17.50	3.00~5.00	0.15~0.45
Remark: Products produced as per other specifications or technical agreements (if need) are available.

Typical delivery condition & mechanical properties

Delivery Condition	Mechanical Properties
	Rp0.2 (N/mm2)	Rm (N/mm2)	A/%	Zb/%	Akv2d/J	HBW	HRC
Cond. A 1040℃±15℃	/	/	/	/	/	≤363	≤38
H900, 480℃, 1h, air	≥1170	≥1310	≥10	≥40	/	≥388	≥40
H925, 495℃, 4h, air	≥1070	≥1170	≥10	≥44	≥6.8	≥375	≥38
H1025, 550℃, 4h, air	≥1000	≥1070	≥12	≥45	≥20	≥331	≥35
H1075, 580℃, 4h, air	≥860	≥1000	≥13	≥45	≥27	≥311	≥32
H1100, 595℃, 4h, air	≥795	≥965	≥14	≥45	≥34	≥302	≥31
H1150, 620℃, 4h, air	≥725	≥930	≥16	≥50	≥41	≥277	≥28
H1150M, 760℃, 2h, air; 620℃, 4h, air	≥520	≥795	≥18	≥55	≥75	≥255	≥24
H1150D, 620℃, 4h, air; 620℃, 4h, air	≥725	≥860	≥16	≥50	≥41	255~311	24~33
Remark: Products produced as per other specifications or technical agreements (if need) are available.

FAQ

1. Are you a factory or trader?

-Factory, Shifang Xin'gong is a professional manufacturer with own smelting, forging, heat treatment and precision machining equipment, has own test lab.

-SMTCO is the only direct export department of Shifang Xin'gong.

2. Do you have stock?

-Yes, we have 4 stock warehouses located in Sichuan, Jiangsu and Guangdong province, with more than 3000 tons stock, including steel bars and plates/sheets of 9Cr18, 9Cr18Mo, 9Cr18MoV, 1.4313, 17-4PH, 15-5PH etc.

3. Customized production capability?

-Yes, we can conduct research & develop customized production according to special technical requirements and small batch.

4. How to guarantee the quality?

-4.1 Achieved certification of ISO 9001:2015 and GJB 9001C-2017. MTC according to EN 10204-3.1.

-4.2 Fully traceable in the entire production & inspection process. Inspection covers chemical composition analysis, mechanical property testing, macro and micro structure inspection, 100% ultrasonic testing (NDT), dimension and surface inspections, special requiremnets as required.

-4.3 The third party inspection before delivery is accepted.

5. MOQ and sample?

-1 kg for products in stock, max 3 tons for customized products.

-Sample or small trial batch are accepted.

6. Price level?

-Middle or little higher than market average, because of the complete quality control during the entire production process with more than 99.9% qualify rate.

7. Delivery time?

-7 days for stock – prepare export license and documents.

-65 days for new production – start from smelting.

8. Which port nearest?

-Shanghai port for transportation by sea, Chengdu or Suzhou railway station for transportation by train (China-Europe Railway Express). 

9. What is your positioning? 

-Better price and lower MOQ than large manufacturers, more professionalism and better quality control than small and medium-sized ones.

-Aim to be the most cost-effective one-stop solution provider for special stainless steel.

10. Core competitiveness?

-Sufficient stock & Small batch available.

-System-driven, fully traceable.

-Uphold standards, control processes.

-Demand-driven production, precision customization.

-Fully monitored by own lab, third-party inspection accepted.