JIS G3103 SB450 Steel Plate | SB450 Boiler Vessel Plate supplier

SB450 is the middle carbon grade in JIS G3103. Buyers search JIS G3103 SB450, SB450 steel plate, SB450 boiler plate, SB450 vessel plate and SB450 supplier. The letters SB mean boiler plate. 450 is the tensile class in N/mm². This page is not SB410. SB410 is 410–550 MPa. This page is not SB480. SB480 is 480–620 MPa. This page is not SB450M. SB450M carries 0.45–0.60% Mo. This page is not JIS G3115 SPV355. G3115 is a different Japanese vessel book.

Tensile is 450–590 MPa. Yield is 245 MPa min. Thickness is 6–200 mm. Delivery is as-rolled up to 50 mm and normalized above 50 mm unless the order names another route. SHH STEEL is a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin). We buy this grade from qualified Chinese mills, check the certificate against JIS G3103, and ship it to fabricators in the USA, Europe, Middle East, Southeast Asia, Africa and South America.

If a drawing says SB410, we will not ship SB450 and call stronger automatically acceptable. If a drawing says SB450M, we will not ship SB450 and call 450 enough. Dual marking with ASME SA515 Grade 65 is possible only when both books are fully met.

This plate sits in pressure vessel steel plates and carbon steel plates. Japanese vessel sisters belong on JIS G3115. High-temp European carbon sisters belong on EN 10028-2. ASME high-temp carbon sisters belong on ASME SA515.

Cast analysis follows JIS G3103. Product analysis is supplied when ordered.

Cast Analysis and Product Analysis — JIS G3103 SB450

JIS G3103 allows Mn to rise 0.06% for every 0.01% C drop, with Mn still capped at 1.50%. Cu + Ni + Cr + Mo is 1.00% max. Cr + Mo is 0.32% max. SB450 is carbon steel. It is not a molybdenum grade. If the file wants 0.45–0.60% Mo, the grade name is SB450M. SHH STEEL prints heat analysis on every certificate and product analysis when ordered. Density is 7.85 g/cm³.

Buyers search SB450 mechanical properties, SB450 yield strength and SB450 tensile strength.

Tensile and Yield — JIS G3103 SB450

Bend test is 180°. Inside radius is 0.75t up to 25 mm and 1.00t from 25 to 50 mm. Do not quote 225 MPa yield on SB450. That number belongs to SB410. Do not treat 450–590 MPa as permission to stamp EN 10028-2 P265GH or Q245R steel plate without checking both books.

Buyers pick SB450 when a Japanese boiler or intermediate-temperature vessel file wants 450 MPa carbon plate. Search phrases such as SB450 boiler plate, JIS G3103 SB450 and SB450 vessel plate all point here.

It is not a substitute for EN 10028-2 16Mo3. That grade is 0.3Mo. It is not a substitute for ASME SA204 Grade A. That grade is molybdenum vessel steel. It is not a low-temperature plate. Low-temperature work belongs on GB/T 713.3 16MnDR. Dual marking is possible only when both books are met.

SHH STEEL supplies this plate to fabricators in the United States, Mexico, South America, Europe, the Middle East, Africa and Asia.

SB450 is killed carbon boiler plate. Treat welding as production welding, and as boiler / PED / ASME Code welding when the equipment is a vessel.

Qualify to the applicable code. Consumables must match the 450–590 MPa band. A procedure written for ASME SA516 Grade 70 may be heavy on strength. A Cr-Mo procedure written for ASME SA387 Grade 12 Class 1 is the wrong family. Preheat is usually light on thin plate and must follow the qualified WPS on thicker normalized plate. The fabricator owns the WPS. SHH STEEL can share mill heat data for that review.

Usual delivery from SHH STEEL follows JIS G3103:

• Thickness ≤ 50 mm: as-rolled. Normalizing or stress-relief may be added when ordered.
• Thickness > 50 mm up to 200 mm: normalized, or heated uniformly during hot forming to give the same effect as normalizing.

This is not QT from EN 10028-6 P355Q. This is not TMCP from EN 10028-5.

If the vessel will see PWHT, say so. Simulated PWHT on test coupons is worth naming. Extra simulation, 3.2 hold points or special NDE add time. Plan about two months when those extras are on the order.

The certificate lists JIS G3103 SB450; heat number; cast analysis; product analysis when ordered; tensile; bend; delivery condition. Certificates may be EN 10204 3.1 or EN 10204 3.2.

Usual supply range from SHH STEEL for SB450 boiler vessel plate:

• Thickness: 6 mm – 200 mm
• Width: 1500 mm – 4000 mm
• Length: 3000 mm – 12000 mm

Mo boiler plate belongs on SB450M / SB480M. Japanese SPV plate belongs on JIS G3115 SPV355.

Dimensional limits for JIS G3103 SB450 follow JIS G3193 unless the purchase order names another table. Do not apply ASTM A36 structural tolerances to a boiler plate without writing them. When dual-named against ASME SA515 Grade 65, write whether JIS G3193 or SA-20 governs the minus on thickness.

Typical thickness tolerance idea for SB450 (JIS G3193 reference)

Width on 1500–4000 mm plate is commonly held to about ±20–25 mm unless the mill quote names a tighter extra. Length on 3000–12000 mm plate is commonly held to about +50 / 0 mm or ±25 mm by mill practice. Flatness follows JIS G3193 unless a tighter class is written. Edge condition is mill edge or cut edge as ordered. If the vessel calculation used minimum thickness after corrosion, write the allowed minus on the RFQ. SHH STEEL will not assume a zero-minus extra on SB450 unless the order says so.

JIS G3103 SB450 already defines tensile, bend and the as-rolled / normalized split. Extra items still have to be written on the purchase order. SHH STEEL will not assume them from the grade name alone.

Elevated-temperature proof. JIS G3103 is a mid-to-high temperature boiler book. Write the test temperatures if the design needs Rp0.2 at 200–400 °C.

Charpy details. SB450 does not assume −20 °C or −40 °C. Write temperature, joules, location and orientation if impact is required.

Impact after simulated PWHT. When the boiler will be stress-relieved, name hold temperature, hold time and cooling rate on the coupon.

Product analysis. Especially C by thickness band, P, S, Mn, Cu, Ni, Cr and Mo.

Through-thickness / Z-test. Name Z15, Z25 or Z35 when the plate will be welded in the thickness direction.

NDE. JIS ultrasonic practice, EN 10160, ASTM A435 or ASTM A578 as named. Write scanning extent and acceptance class.

Hardness. If the destination file caps hardness after rolling or after simulated PWHT, write the max HB and the test location.

HIC / SSC / NACE. Only when the equipment is sour service. SB450 is not automatically NACE MR0175 / ISO 15156.

Third-party witness. EN 10204 3.2 with SGS, TÜV, BV, ABS, CCS, DNV, NK, KR or the inspector named. Hold points for normalizing, tensile, bend and UT should be listed on the ITP.

Identification and stamping. Heat number, grade SB450, JIS G3103, thickness and mill logo on each plate. Transfer marks after cutting if the plate will be cut before shipment.

SB450 is the plate for a Japanese boiler file that wants 450 MPa carbon steel. It is the wrong plate for 0.5Mo service. That work is SB450M. It is the wrong plate for high-strength QT. That work is EN 10028-6 P355Q.

SHH STEEL sources JIS G3103 SB450 from first-line Chinese mills and ships it on worldwide terms. Partner mills include Wuyang (Wugang), Angang, Shougang, Hanye, Anyang Iron & Steel, Baosteel, Xinyu, Xingcheng, Yongjin, Tsingshan, TISCO (Taiyuan), Jiuquan (JISCO), Lianzhong, Zhangpu and Baoxin, plus other qualified mills when the size or normalizing route requires it.

Mill test certificates are issued to EN 10204 3.1 as standard. EN 10204 3.2 is arranged when the order names a third-party hold point.

Usual stock and rolling thickness: 8 mm, 10 mm, 12 mm, 16 mm, 20 mm, 25 mm, 30 mm, 32 mm, 36 mm, 40 mm, 50 mm, 60 mm, 80 mm, 100 mm, thicker by mill agreement up to 200 mm.

Processing: CNC or flame cutting, bevel, flattening, UT to the named class.

Trade terms: FOB Shanghai main, CIF destination available. Payment: TT, LC, or TT + LC.

Ocean time from Shanghai: US West 14–18 days; US Gulf 28–35 days; Rotterdam / Antwerp 28–35 days; Jebel Ali 18–25 days; Singapore 7–12 days; other ports quoted.

Third-party: SGS, TÜV, BV, ABS, CCS, GL, VL, DNV, RINA, NK, KR, or the inspector named.

SHH STEEL is a global steel mill sourcing partner with mill partnerships in China. We supply ASTM, ASME, EN, DIN, JIS and GB steel to buyers in the United States, Europe, the Middle East, Southeast Asia, Africa and South America. Origin is mill-direct, China origin.

SHH STEEL has supplied steel plates to the USA, Mexico, Argentina, Peru, El Salvador, Spain, Netherlands, Germany, UAE, Saudi Arabia, South Africa, India, Thailand, Singapore, Vietnam, the Philippines, Japan and Korea.

Typical lead time: ex-stock 5–7 days; standard rolling / normalizing about 45–60 days; simulated PWHT / 3.2 about 2 months.

Experience on this grade is simple: keep the number after SB. 410, 450 and 480 are three different purchase orders, and none of them is SB450M. SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) prices SB450 from first-line mills, reports JIS G3103 chemistry, records as-rolled or normalized by thickness, and issues 3.1 as standard or 3.2 when specified.

We keep the grade on the order. SB450 is not SB410. SB450 is not SB450M. SB450 is not JIS G3115 SPV355. SB450 is not Q245R steel plate. If the drawing says SB480, we will not ship SB450 and call 450 close.

JIS G3103 SB450 Steel Plate is Japanese carbon boiler and pressure-vessel plate at 450–590 MPa tensile and 245 MPa yield. Whether the inquiry says JIS G3103 SB450, SB450 boiler plate, SB450 vessel plate or SB450 supplier, SHH STEEL as a global steel mill sourcing partner and steel manufacturer & exporter (mill-direct, China origin) supplies plate with SB450 chemistry, recorded as-rolled or normalized delivery, and EN 10204 3.1 or 3.2 certification.

SHH STEEL supplies JIS G3103 SB450 Boiler Vessel Plate to the USA, Mexico, South America, Europe, the Middle East, Africa and Asia for work that actually names this grade.

Contact SHH STEEL for mill rolling, stock inquiry, cutting, bevel, 3.2 inspection or a worldwide quotation.

JIS G3103 SB450 Steel Plate, SB450 boiler vessel plate, SB450 supplier, SHH STEEL