S355JR steel and S355MC steel are two different structural steel materials. They have the following differences:
1. Material usage
S355JR steel is mainly used in general structural engineering and manufacturing fields, such as bridges, buildings and mechanical equipment. S355MC steel is a high-strength cold-formed hot-rolled steel that is widely used in the automotive industry and the manufacture of cold-formed components.
2. Strength level
S355JR steel usually has a minimum yield strength of 355MPa, and its tensile strength is 470-630MPa when the thickness is less than 16 mm. In comparison, S355MC steel has a higher yield strength, usually 355-510MPa, and a tensile strength of 430-550MPa.
| Parameter | S355JR | S355MC | Difference Explanation |
|---|---|---|---|
| Yield Strength ReH (thickness ≤16mm) | ≥355 MPa | ≥355 MPa | Essentially equivalent |
| Yield Strength ReH (16-40mm) | ≥345 MPa | ≥345 MPa | Essentially equivalent |
| Yield Strength ReH (40-63mm) | ≥335 MPa | - | S355JR has a greater decrease in yield strength with increasing thickness |
| Tensile Strength Rm | 470-630 MPa | 430-550 MPa | S355JR has a higher upper limit of tensile strength |
| Elongation A80 | ≥22% | ≥22% (t<3mm)≥23% (t≥3mm) | S355MC has slightly better plasticity |
| Yield Ratio (ReH/Rm) | ~0.75 | ~0.70 | S355MC has a lower yield ratio and better deformation resistance |
3.Composition and processing
The chemical composition of these two steels is slightly different. S355JR steel contains elements such as carbon, silicon, manganese, sulfur and phosphorus, while S355MC steel also contains trace alloying elements such as niobium, vanadium and titanium. In addition, S355JR steel is usually supplied in hot-rolled or heat-treated form, while S355MC steel is supplied in hot-rolled form and has good cold forming properties.
| Element | S355JR | S355MC | Difference Explanation |
|---|---|---|---|
| C (Carbon) | 0.24% | 0.12% | S355MC has significantly reduced carbon content, improving weldability |
| Si (Silicon) | 0.55% | 0.50% | Essentially equivalent with slight differences |
| Mn (Manganese) | 1.60% | 1.50% | S355JR has a slightly higher upper limit |
| P (Phosphorus) | 0.045% | 0.025% | S355MC has stricter impurity control |
| S (Sulfur) | 0.045% | 0.020% | S355MC has stricter impurity control |
| Al (Aluminum) | - | 0.015% (min) | S355MC contains aluminum for grain refinement |
| Nb (Niobium) | 0.05% | 0.09% | S355MC contains niobium to enhance strength and toughness |
| V (Vanadium) | 0.12% | 0.20% | S355MC contains vanadium to enhance strength and toughness |
| Ti (Titanium) | 0.04% | 0.15% | S355MC contains titanium to enhance strength and toughness |
| (Nb+V+Ti) | - | 0.22% | Total content control of microalloying elements in S355MC |
| N (Nitrogen) | 0.009% | - | S355JR has stricter nitrogen control |
| CEV (Carbon Equivalent) | 0.45-0.49% (depending on thickness) | 0.13-0.17% | S355MC has significantly lower carbon equivalent, greatly improving weldability |
4.Application Scenarios Comparison
| Application Scenario | Recommended Material | Reason |
|---|---|---|
| Building Structures, Bridges | S355JR | Sufficient strength and lower cost |
| Automotive Chassis, Frames | S355MC | Excellent cold formability, lightweight, and high safety |
| Construction Machinery Structural Parts | S355MC | Fatigue resistance, impact resistance, and ability to withstand dynamic loads |
| Complex Stamped Parts | S355MC | Superior cold bending performance and resistance to cracking |
| Welded Load-Bearing Structures | S355MC | Excellent weldability, no preheating required (≤12mm) |
| General Mechanical Brackets | S355JR | Balanced performance and cost |
5.Selection Guidelines
Choose S355JR if:
Application involves simple cutting, welding, and assembly (e.g., building steel frames, fixed mechanical supports).
Budget is a priority (lower cost than S355MC).
No complex cold forming (e.g., stamping, multi-pass bending) is required.
Choose S355MC if:
Need cold forming processes (stamping, bending, rolling) for complex shapes.
Pursue lightweight design (thickness reduction 5-10% vs. S355JR under same strength).
Application involves dynamic loads or fatigue (e.g., automotive chassis, frequent-load machinery parts).
If you want to learn more about GNEE's products, you can send an email to info@gneesteels.com. We are more than happy to assist you.
FAQ
Q: What is the yield strength of S355MC steel?
A: 355 MPa
The name of grade S355MC refers to its upper yield strength. This is 355 MPa.
Q: What is S355MC steel?
A: S355MC is a hot-rolled, high-strength low-alloy steel. It combines high strength with outstanding formability and consistent quality. It replaces conventional construction steel for applications where high strength is paramount.
Q: What does MC stand for in S355MC?
A: The "MC" in the designation stands for "thermomechanically rolled", which means that the steel is produced by a controlled process that involves heating and rolling at high temperatures to produce the desired mechanical properties. Composition of S355MC automotive steel(%, cast analysis)
Q: What is the difference between s355j2 and S355MC?
A: Strength level: S355JR steel usually has a minimum yield strength of 355MPa, and its tensile strength is 470-630MPa when the thickness is less than 16 mm. In comparison, S355MC steel has a higher yield strength, usually 355-510MPa, and a tensile strength of 430-550MPa.
Q: What is the equivalent of S355MC?
A: S355mc belongs to the Euro norm specification of EN 10149-2. The En 10149-2 S355mc Equivalent is DIN, WNr QStE360TM, JIS SPFH540, with France having the AFNOR E355D and E390D grade. in England is BS 46F35 and BS 46F40, with Italy having the UNI FeE355TM grade and Spain showcasing the UNE AE390HC grade.
Q: What is S355MC steel equivalent to?
A: The EN10149 S355MC steel is equivalent to SEW092 QStE380TM and NFA E355D steel grades.
Q: What is the hardness of S355MC material?
A: Typically, S355MC has a hardness range of approximately 140-180 HB (Brinell Hardness) or 143-184 HV (Vickers Hardness). This hardness level indicates the material's resistance to indentation or penetration by a hard object.
Q: What is the yield strength of S355MC material?
A: 355 MPa
Thanks to its fine-grained microstructure and high degree of purity, grade S355MC is well suited for cold bending, folding and cold flanging without cracking. The name of grade S355MC refers to its upper yield strength. This is 355 MPa.
Q: What is the main difference in S355N vs S355MC?
A: S355N is a normalized steel for structural toughness, while S355MC is thermomechanically rolled for cold-forming applications.
Q: How do S355N and S355MC toughness compare?
A: S355N guarantees ≥27 J at -20°C for structural reliability; S355MC's toughness is not mandatory, prioritizing formability.
Q: Which is better for welding, S355N or S355MC?
A: S355MC's lower CEV (≤0.35% vs ≤0.43%) and impurities enhance weldability, ideal for cold-formed parts.
Q: What applications suit S355N vs S355MC?
A: S355N is ideal for bridges and cranes; S355MC suits automotive frames and machinery parts, similar to en 10025 3 s275n normalized structural steel plate.
Q: How do S355N and S355MC costs compare?
A: S355MC is 10-20% more expensive due to thermomechanical processing and formability focus.
| Grades Of Carbon and Low-alloy High-strength Steels Supplied By GNEE | |||||
| ASTM/ASME | ASTM A36/A36M | ASTM A36 | |||
| ASTM A283/A283M | ASTM A283 Grade A | ASTM A283 Grade B | ASTM A283 Grade C | ASTM A283 Grade D | |
| ASTM A514/A514M | ASTM A514 Grade A | ASTM A514 Grade B | ASTM A514 Grade C | ASTM A514 Grade E | |
| ASTM A514 Grade F | ASTM A514 Grade H | ASTM A514 Grade J | ASTM A514 Grade K | ||
| ASTM A514 Grade M | ASTM A514 Grade P | ASTM A514 Grade Q | ASTM A514 Grade R | ||
| ASTM A514 Grade S | ASTM A514 Grade T | ||||
| ASTM A572/A572M | ASTM A572 Grade 42 | ASTM A572 Grade 50 | ASTM A572 Grade 55 | ASTM A572 Grade 60 | |
| ASTM A572 Grade 65 | |||||
| ASTM A573/A573M | ASTM A573 Grade 58 | ASTM A573 Grade 65 | ASTM A573 Grade 70 | ||
| ASTM A588/A588M | ASTM A588 Grade A | ASTM A588 Grade B | ASTM A588 Grade C | ASTM A588 Grade K | |
| ASTM A633/A633M | ASTM A633 Grade A | ASTM A633 Grade C | ASTM A633 Grade D | ASTM A633 Grade E | |
| ASTM A656/A656M | ASTM A656 Grade 50 | ASTM A656 Grade 60 | ASTM A656 Grade 70 | ASTM A656 Grade 80 | |
| ASTM A709/A709M | ASTM A709 Grade 36 | ASTM A709 Grade 50 | ASTM A709 Grade 50S | ASTM A709 Grade 50W | |
| ASTM A709 Grade HPS 50W | ASTM A709 Grade HPS 70W | ASTM A709 Grade 100 | ASTM A709 Grade 100W | ||
| ASTM A709 Grade HPS 100W | |||||
| ASME SA36/SA36M | ASME SA36 | ||||
| ASME SA283/SA283M | ASME SA283 Grade A | ASME SA283 Grade B | ASME SA283 Grade C | ASME SA283 Grade D | |
| ASME SA514/SA514M | ASME SA514 Grade A | ASME SA514 Grade B | ASME SA514 Grade C | ASME SA514 Grade E | |
| ASME SA514 Grade F | ASME SA514 Grade H | ASME SA514 Grade J | ASME SA514 Grade K | ||
| ASME SA514 Grade M | ASME SA514 Grade P | ASME SA514 Grade Q | ASME SA514 Grade R | ||
| ASME SA514 Grade S | ASME SA514 Grade T | ||||
| ASME SA572/SA572M | ASME SA572 Grade 42 | ASME SA572 Grade 50 | ASME SA572 Grade 55 | ASME SA572 Grade 60 | |
| ASME SA572 Grade 65 | |||||
| ASME SA573/SA573M | ASME SA573 Grade 58 | ASME SA573 Grade 65 | ASME SA573 Grade 70 | ||
| ASME SA588/SA588M | ASME SA588 Grade A | ASME SA588 Grade B | ASME SA588 Grade C | ASME SA588 Grade K | |
| ASME SA633/SA633M | ASME SA633 Grade A | ASME SA633 Grade C | ASME SA633 Grade D | ASME SA633 Grade E | |
| ASME SA656/SA656M | ASME SA656 Grade 50 | ASME SA656 Grade 60 | ASME SA656 Grade 70 | ASME SA656 Grade 80 | |
| ASME SA709/SA709M | ASME SA709 Grade 36 | ASME SA709 Grade 50 | ASME SA709 Grade 50S | ASME SA709 Grade 50W | |
| ASME SA709 Grade HPS 50W | ASME SA709 Grade HPS 70W | ASME SA709 Grade 100 | ASME SA709 Grade 100W | ||
| ASME SA709 Grade HPS 100W | |||||
| EN10025 | EN10025-2 | EN10025-2 S235J0 | EN10025-2 S275J0 | EN10025-2 S355J0 | EN10025-2 S355K2 |
| EN10025-2 S235JR | EN10025-2 S275JR | EN10025-2 S355JR | EN10025-2 S420J0 | ||
| EN10025-2 S235J2 | EN10025-2 S275J2 | EN10025-2 S355J2 | |||
| EN10025-3 | EN10025-3 S275N | EN10025-3 S355N | EN10025-3 S420N | EN10025-3 S460N | |
| EN10025-3 S275NL | EN10025-3 S355NL | EN10025-3 S420NL | EN10025-3 S460NL | ||
| EN10025-4 | EN10025-4 S275M | EN10025-4 S355M | EN10025-4 S420M | EN10025-4 S460M | |
| EN10025-4 S275ML | EN10025-4 S355ML | EN10025-4 S420ML | EN10025-4 S460ML | ||
| EN10025-6 | EN10025-6 S460Q | EN10025-6 S460QL | EN10025-6 S460QL1 | EN10025-6 S500Q | |
| EN10025-6 S500QL | EN10025-6 S500QL1 | EN10025-6 S550Q | EN10025-6 S550QL | ||
| EN10025-6 S550QL1 | EN10025-6 S620Q | EN10025-6 S620QL | EN10025-6 S620QL1 | ||
| EN10025-6 S690Q | EN10025-6 S690QL | EN10025-6 S690Q1 | EN10025-6 S890Q | ||
| EN10025-6 S890QL | EN10025-6 S890QL1 | EN10025-6 S960Q | EN10025-6 S960QL | ||
| EN 10149 | EN 10149-2 | S315MC | S355MC | S420MC | S460MC |
| S500MC | S550MC | S600MC | S650MC | ||
| S700MC | S900MC | S960MC | |||
| JIS | JIS G3101 | JIS G3101 SS330 | JIS G3101 SS400 | JIS G3101 SS490 | JIS G3101 SS540 |
| JIS G3106 | JIS G3106 SM400A | JIS G3106 SM400B | JIS G3106 SM400C | JIS G3106 SM490A | |
| JIS G3106 SM490YA | JIS G3106 SM490B | JIS G3106 SM490YB | JIS G3106 SM490C | ||
| JIS G3106 SM520B | JIS G3106 SM520C | JIS G3106 SM570 | |||
| DIN | DIN 17100 | DIN17100 St52-3 | DIN17100 St37-2 | DIN17100 St37-3 | DIN17100 RSt37-2 |
| DIN17100 USt37-2 | |||||
| DIN 17102 | DIN17102 StE315 | DIN17102 EStE315 | DIN17102 TStE315 | DIN17102 WStE315 | |
| DIN17102 StE355 | DIN17102 EStE355 | DIN17102 TStE355 | DIN17102 WStE355 | ||
| DIN17102 StE380 | DIN17102 EStE380 | DIN17102 TStE380 | DIN17102 WStE380 | ||
| DIN17102 StE420 | DIN17102 EStE420 | DIN17102 TStE420 | DIN17102 WStE420 | ||
| DIN17102 StE460 | DIN17102 EStE460 | DIN17102 TStE460 | DIN17102 WStE460 | ||
| DIN17102 StE500 | DIN17102 EStE500 | DIN17102 TStE500 | DIN17102 WStE500 | ||
| DIN17102 EStE285 | |||||
| GB | GB/T700 | GB/T700 Q235A | GB/T700 Q235B | GB/T700 Q235C | GB/T700 Q235D |
| GB/T700 Q275 | |||||
| GB/T1591 | GB/T1591 Q345A | GB/T1591 Q390A | GB/T1591 Q420A | GB/T1591 Q420E | |
| GB/T1591 Q345B | GB/T1591 Q390B | GB/T1591 Q420B | GB/T1591 Q460C | ||
| GB/T1591 Q345C | GB/T1591 Q390C | GB/T1591 Q420C | GB/T1591 Q460D | ||
| GB/T1591 Q345D | GB/T1591 Q390D | GB/T1591 Q420D | GB/T1591 Q460E | ||
| GB/T1591 Q345E | GB/T1591 Q390E | ||||
| GB/T16270 | GB/T16270 Q550C | GB/T16270 Q550D | GB/T16270 Q550E | GB/T16270 Q550F | |
| GB/T16270 Q620C | GB/T16270 Q620D | GB/T16270 Q620E | GB/T16270 Q620F | ||
| GB/T16270 Q690C | GB/T16270 Q690D | GB/T16270 Q690E | GB/T16270 Q690F | ||
| GB/T16270 Q800C | GB/T16270 Q800D | GB/T16270 Q800E | GB/T16270 Q800F | ||
| GB/T16270 Q890C | GB/T16270 Q890D | GB/T16270 Q890E | GB/T16270 Q890F | ||
| GB/T16270 Q960C | GB/T16270 Q960D | GB/T16270 Q960E | GB/T16270 Q960F | ||
| GB/T16270 Q500 | |||||
