Sachiya Steel International Is One Of The Leading Manufacturer And Exporter Of High Quality Duplex Steel S31803 Nuts And Bolts, which always react more sensitively towards precipitation. Duplex S31803 Hex Head Bolts should be ensured that the temperature range between 950 Degree C and 700 Degree C is traversed in no more than two minutes. Due to the possibility that other undesired metallic phases could arise, these Duplex S32205 Hex Head Nuts is further cooling down to 300 Degree C and should be undertaken as quickly as possible. Duplex S31803 Square Bolts are also easy to weld according to the usual rules for welding stainless steels.
Extremely low and extremely high heat input should be avoided in these Duplex S32205 Square Nuts, depending on the seam geometry, the thickness of the steel and the welding process. Therefore Duplex S31803 Eye Bolts is necessary to monitor inter – pass temperature and the heat input during the welding process. The safest way to a balanced ferrite / austenite ratio in the weld seam of these Duplex S32205 Eye Nuts is subsequent heat treatment, so-called solution annealing.
For Duplex S31803 T-Bolts, holding times of 2 minutes to 3 minutes for each mm of wall thickness at temperatures around 1080 Degree C are sufficient to achieve a balanced austenite / ferrite ratio. After annealing, cooling of these Duplex S32205 T-Nuts as rapidly as possible is advisable.
Duplex S31803 / S32205 Bolt/Nut Specifications |
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| Specifications | : | ASTM A 479 ASME SA 479 |
| Standard | : | DIN, ASTM, BS and all International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Type | : | Hex Head Bolts, Square Bolts, U bolts, Eye bolts, T bolt, Hex Bolt, Lag Bolts, Counter sunk Bolts, Hex Head nuts, Square nuts, Lock nuts, Eye nuts, wing nuts, T nuts, Panel Nuts, Coupling Nuts, Dome nuts, Acorn Nuts. |
S31803 / S32205 Duplex Bolt/Nut Chemical Composition
| S31803 / S32205 | C | N | P | Si | Mn | Mo | Fe | Cr | S | Ni |
| 1.0 | 0.03 | 0.02 | 2.0 | 3.0 – 3.5 | 22.0 – 23.0 | 0.03 | 4.5 – 6.5 | 0.14 – 0.2 | Bal |
Duplex Steel S31803 / S32205 Bolt/Nut Mechanical Properties
| S31803 / S32205 | Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 80000 , MPa – 550 | Psi – 116000 , MPa – 800 | 15 % |
Equivalent Grades for S31803 / S32205 Duplex Stainless Steel Bolt/Nut
| STANDARD | UNS | WERKSTOFF NR. |
| Duplex S31803 | S31803 | 1.4462 |
| Duplex S32205 | S32205 | 1.4462 |
Duplex S31803 / S32205 Bolt/Nut Application Industries
- Off-Shore Oil Drilling Companies
- Power Generation
- Petrochemicals
- Gas Processing
- Specialty Chemicals
- Pharmaceuticals
- Pharmaceutical Equipment
- Chemical Equipment
- Sea Water Equipment
- Heat Exchangers
- Condensers
- Pulp and Paper Industry
S31803 / S32205 Duplex Bolt/Nut Test Certificates
We at Sachiya Steel International provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report. We also provide Standard certificates like EN 10204 3.1 and additional requirement like. NACE MR 01075. FERRIT CONTENT as per norms if requested by clients.
• EN 10204/3.1B,
• Raw Materials Certificate
• 100% Radiography Test Report
• Third Party Inspection Report, etc
Material Testing
We at Sachiya Steel International ensure that all our materials go through strict quality tests before dispatching them to our clients.
• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and Macro Test
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test
Documentation
• Commercial Invoice which includes HS Code
• Packing List including net weight and gross weight, number of boxes, Marks and Numbers
• Certificate of Origin legalized/attested by Chamber of Commerce or Embassy
• Fumigation Certificates
• Raw Material Test Reports
• Material Traceability Records
• Quality Assurance Plan (QAP)
• Heat Treatment Charts
• Test Certificates certifying NACE MR0103, NACE MR0175
• Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
• Guarantee Letter
• NABL approved Laboratory Test Reports
• Welding Procedure Specification/Procedure Qualification Record, WPS/PQR
• Form A for the purposes of the Generalized System of Preferences (GSP)