1. SS400 carbon steel plate and sheet hot rolled mild steel plates with 20mm thick steel plate 2. cut to size flat steel plate

1. DESCRIPTION OF GOODS: SS400 carbon steel plate and sheet hot rolled mild steel plates with  20mm thick steel plate

        One: Hot Rolled steel plates: Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material. After the grains deform during processing, they recrystallize, which maintains an equiaxedmicrostructure and prevents the metal from work hardening. The starting material is usually large pieces of metal, like semi-finished casting products, such as slabs, blooms, and billets. If these products came from a continuous casting operation the products are usually fed directly into the rolling mills at the proper temperature. In smaller operations the material starts at room temperature and must be heated. This is done in a gas- or oil-fired soaking pit for larger workpieces and for smaller workpieces induction heating is used. As the material is worked the temperature must be monitored to make sure it remains above the recrystallization temperature. To maintain a safety factor a finishing temperature is defined above the recrystallization temperature; this is usually 50 to 100 °C (90 to 180 °F) above the recrystallization temperature. If the temperature does drop below this temperature the material must be re-heated before more hot rolling.

       Hot rolled metals generally have little directionality in their mechanical properties and deformation induced residual stresses. However, in certain instances non-metallic inclusions will impart some directionality and workpieces less than 20 mm (0.79 in) thick often have some directional properties. Also, non-uniformed cooling will induce a lot of residual stresses, which usually occurs in shapes that have a non-uniform cross-section, such as I-beams and H-beams. While the finished product is of good quality, the surface is covered in mill scale, which is an oxide that forms at high-temperatures. It is usually removed via pickling or the smooth clean surface process, which reveals a smooth surface.Dimensional tolerances are usually 2 to 5% of the overall dimension.

Hot rolled mild steel seems to have a wider tolerance for amount of included carbon than cold rolled, making it a bit more problematic to use as a blacksmith. Also for similar metals, hot rolled seems to typically be less costly.

Steel Production: When iron is smelted from its ore by commercial processes, it contains more carbon than is desirable. To become steel, it must be melted and reprocessed to reduce the carbon to the correct amount, at which point other elements can be added. This liquid is then continuously cast into long slabs or cast into ingots. Approximately 96% of steel is continuously cast, while only 4% is produced as cast steel ingots.

The ingots are then heated in a soaking pit and hot rolled into slabs, blooms, or billets. Slabs are hot or cold rolled into sheet metal or plates. Billets are hot or cold rolled into bars, rods, and wire. Blooms are hot or cold rolled into structural steel, such as I-beams and rails. In modern foundries these processes often occur in one assembly line, with ore coming in and finished steel coming out. Sometimes after a steel's final rolling it is heat treated for strength, however this is relatively rare.

STEEL GRADES: Carbon steel, composed simply of iron and carbon, accounts for 90% of steel production.High strength low alloy steel has small additions (usually < 2% by weight) of other elements, typically 1.5% manganese, to provide additional strength for a modest price increase.

2. SS400 carbon steel plate and sheet hot rolled mild steel plates with  20mm thick steel plate

we have SS400 steel plate on STOCK. STOCK SIZES AS BELOW.

SS400	pass	09H-24568-505	22.00	2438	6096	1
SS400-K	pass	09Z-06510-089	6.00	1560	7600	11
SS400	pass	09H-06187-507	10.00	2250	12060	1
SS400	pass	09H-26438-501	10.00	2438	6096	1
SS400	pass	09H-41062-511	10.00	2370	12030	1
SS400	pass	09H-32613-518	10.00	2438	6096	1
SS400-W	pass	09Z-75054-092	11.00	2100	7500	1
SS400	pass	09Z-78638-030	16.00	1950	5320	1
SS400-H	pass	09H-60998-504	25.00	2760	5700	1
SS400-H	pass	09H-53206-503	25.00	2760	5700	1
SS400	pass	09H-74809-504	10.00	2500	8000	1
SS400-H	pass	09Z-82295-099	16.00	2000	6000	1
SS400-H	pass	09Z-82295-099	16.00	2000	6000	1
SS400-H	pass	09H-66653-502	32.00	2400	5800	1
SS400	pass	09H-72235-502	36.00	3011	5871	1
SS400	pass	09H-72235-502	36.00	3011	5871	1
SS400-H	pass	10H-08209-503	50.00	2400	4700	1
SS400-H	pass	10H-08209-503	50.00	2400	4700	1
SS400	pass	10Z-01878-098	12.70	2040	12030	1
SS400	pass	10H-20892-03	40.00	2000	9600	1
SS400	pass	09Z-82188-017	22.00	1900	7500	1
SS400	pass	10Z-61043-002	22.00	1900	7500	1
SS400-H	pass	10H-12896-501	32.00	2400	5800	1
SS400-H	pass	10H-12896-505	32.00	2400	5800	1
SS400-H	pass	10H-12896-505	32.00	2400	5800	1
SS400-H	pass	10H-12897-01	32.00	2400	5800	1
SS400-H	pass	10H-25541-01	40.00	2400	5500	1
SS400-H	pass	10H-25543-01	40.00	2400	5500	1
SS400-H	pass	10H-25543-04	40.00	2400	5500	1
SS400-H	pass	10H-20803-02	28.00	2400	5900	1
SS400-H	pass	10H-20803-03	28.00	2400	5900	1
SS400-H	pass	09H-76919-501	40.00	2400	5500	1
SS400-H	pass	09H-76919-502	40.00	2400	5500	1
SS400-H	pass	09H-76919-502	40.00	2400	5500	1
SS400-H	pass	09H-76921-502	36.00	2400	5500	1
SS400-H	pass	09H-76921-503	36.00	2400	5500	1
SS400-H	pass	10H-09353-01	28.00	2400	5900	1

Chemical composition and Mechanical property

Standard	Grade	C max	Mn max	Si max	P	S	Yield strength max	Tensile strength	Elongation%
JISG3101	SS400	0.22	-	0.30	0.045	0.030	245	400-500	26
GB700	Q235B	0.14-0.22	0.30-0.65	0.30	0.045	0.030	235	375-460	21-26
ASTM	A36	0.24	-	0.40	0.045	0.030	250	400-52	26

3. SS400 carbon steel plate and sheet hot rolled mild steel plates with  20mm thick steel plate

STEEL PLATES PICTURES

SS400 carbon steel plate and sheet hot rolled mild steel plates with 20mm thick steel plate