What is SUS631 (17–7PH)?

Maintaining the superior properties of 18–8 stainless, SUS631 is the most common precipitation hardening stainless steel that can be hardened through heat treatment. It can be subjected to a variety of heat treatment processes to suit working and applications from the softest solution heat treatment to a hard full-hardened finish. This allows it to acquire strength second only to quenched high-carbon martensitic stainless steels. In a solution-heat-treated state, SUS631 is non-magnetic, but demonstrates quite strong magnetic properties after precipitation hardening.

Mechanical Properties

• Quantity
• Value
• Unit

• Young's modulus
• Tensile strength
• Elongation
• Fatigue
• Yield strength

• 200000 - 200000
• 650 - 880
• 8 - 25
• 275 - 275
• 350 - 550

• MPa
• MPa
• %
• MPa
• MPa

Physical Properties

• Quantity
• Value
• Unit

• Thermal expansion
• Thermal conductivity
• Specific heat
• Melting temperature
• Density
• Resistivity

• 10 - 10
• 25 - 25
• 460 - 460
• 1450 - 1510
• 7700 - 7700
• 0.55 - 0.55

• e-6/K
• W/m.K
• J/kg.K
• °C
• kg/m³
• Ohm.mm²/m

Heat Treatment:

Annealing	Quenching	Tempering	Normalizing	Q & T
√	√	√	√	√

Characteristics

• Good Formability
• High Strength
• Excellent Fatigue Properties
• Good Corrosion Resistance
• Minimum Distortion On Heat Treatment

 

Chemical composition %

C	Si	Mn	P	S	Cr	Ni	Al
0.09	1.00	1.00	0.040	0.030	16.00~18.00	6.50~7.75	0.75~1.50

 

Forms of supply

SUS631-CSP Stainless Steel sheet and strip, coil.

Material is supplied in Condition A, ready for fabrication by the user.

Sheet and strip are also produced in the hard-rolled Condition C for applications requiring maximum strength.

JIS G4313 cold rolled stainless steel strip for springs

Condition	Hardness HV
Solution annealed	200 max.
1/2H	350 min.
3/4H	400 min.
H	450 min.

Relate Steel Type

Steel Type	Country Code	C(%)	Si(%)	Al(%)	Mn(%)	P(%)	N(%)	S(%)	Cr(%)
631	CNS	≦0.09	≦1.0	0.75-1.50	≦1.0	≦0.04		≦0.03	16.0-18.0
0Cr17-Ni7A1	GB	≦0.09	≦1.0	0.75-1.50	≦1.0	≦0.035		≦0.03	16.0-18.0
SUS631	JIS	≦0.09	≦1.0	0.75-1.50	≦1.0	≦0.04	0.75-1.50	≦0.03	16.0-18.0
631	AISI	≦0.09	≦1.0	0.75-1.50	≦1.0	≦0.04		≦0.03	16.0-17.5
X7CrNi-A117-7	DIN	≦0.09	≦1.0		≦1.0	≦0.045	0.75-1.50	≦0.03	16.0-18.0
630	CNS	≦0.07	≦1.0		≦1.0	≦0.04		≦0.03	15.0-17.0
0Cr17Ni-4Cu4Nb	GB	≦0.07	≦1.0		≦1.0	≦0.04		≦0.03	15.0-17.5
X5CrNi-CuNb17-4	DIN	≦0.07	≦1.0		≦1.0	≦0.045		≦0.03	15.5-17.5

1. Stock view

   

2. Processing and Technology for heating processing

Cutting processing      Quenching              Tempering                  Annealing

       

3. Quality testing

1.      Inspection Institution

Shanghai Fuda Testing Technology Group Co., LTD. Nanjing Branch  

Focus on analysis, testing, testing, r & D four service areas. Analysis fields include component analysis, formula analysis, failure analysis, structure analysis, methodology development and validation, raw material quality control/evaluation, consistency evaluation, feature analysis and other directions; The testing field involves physical and chemical properties testing, toxic and harmful substances testing, flame retardant performance testing, reliability testing and other directions; The testing field involves energy spectrum, electron microscope, spectrum, chromatography, mass spectrometry and other directions; The r&d field involves formula development, formula upgrading, formula customisation, cooperative research and development and other directions.

Beijing Zhongke Chemical Technology Research Institute 

It is a chemical technology research institution based on scientific research and testing. They adhere to paying equal attention to basic research and applied research, and combining applied research and technology transformation, developing into a comprehensive research institute characterised by "task-oriented disciplines". Approved by the relevant national departments, the company has become a third-party analysis and testing technology service unit, and has obtained CMA qualification certification. It has carried out research and development and design, analysis and testing, test and verification, generic processing, information and intellectual property services, providing public services for innovation of technology-based enterprises. Supported by the government innovation Fund, the institute has been awarded as a national high-tech enterprise.

   

2.Inspection Machining

     

   Metal composition testing machine                      Computerised Materials Torsion Testing Machine                Metal bar composite rod bending tensile strength testing machine

       3. Material test certificate

     4. Packaging 

    In the steel export activities, we also need to pack the steel to prevent the steel from being scattered in the transportation process. In the hoisting process, it is necessary to lift the steel. So steel is very necessary in the export process. Below is the picture of packaging：

According to the requirements of the state of steel materials, the use of binding, bare, frame, pallet.

Packing standard: according to the following national standard requirements (the parts beyond the requirements will be specified separately)

GB／T191 packaging-pictorial marking for handling of goods

GB／T4857 (all parts) basic test for transport packages

GB／T4879 rustproof packaging

GB／T5048 damp-proof packing

GB／T7350water-proof packing

GB／T8166 Package cushioning design

GB/T4892-1996  Hard straight square transport packaging size series

GB/T13201-91 Cylinder transport package size series

 GB/T16471-1996Design and make the size limit of transport package 

5. Logistic

1. Company profile

Luoyue Precision Metal established in 2018, is a leading Stockists and global distributor for Metal Raw Materials like Steel/Aluminum/ Stainless steel/Copper/ Nickel Rods, Bars, Plates, Sheets,Pipes, fittings, fasteners, Inconel alloys, Wire and Wire-Mesh to customers from aerospace, automotive, electronics, precision manufacturing, ordnance, marine, shipbuilding, oil & gas, power plant and construction.

The company has a high-precision, high-efficiency modern processing site, CNC machine tools and complete testing and inspection technology, and introduces international advanced technologies.

           2. Certificates. (Business certificate/ISO9001/Trading certificate/SGS/FormE)

                  .      

          3. Our customers 

                 Customer visits 

           4. Past Inquiry

                  .     

   1.Customer Rating

FAQ
1. Q: Are you a manufacturer?  
 A:We have our own warehouse and have 1000 tons stock. I believe we will be the most suitable supplier for you.  
2. Could we visit your factory?  
 A: Sure, we welcome you to visit the factory , check our production lines and know more about our strength and quality.  
3. Q: Do you have quality control system?  
 A: Yes, we have ISO, BV, SGS certifications and our own quality control laboratory.  
4. Q: Can you arrange the shipment for us?  
 A: Yes, we have designated sea freight and railway freight forwarders with decades of experiences and we get the best  price with earliest vessel and professional service.
5. Q: How long is the delivery time?  
 A: Generally it is 7 days if we have the exact goods in our stock. If not, it will take around 15-20 days to get goods ready for delivery.  
6. Q: Can I get some samples?  
 A: We are glad to provide free samples to you, but we do not offer the freight.  
7. Q: What is your after-sale service?  
 A: We provide after-sale service and offer 100% guarantee on our products.  
8. Q: What is your MOQ?  
 A: 2 Tons  

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