Carbon Steel Square Tube

Carbon Steel Square Tube is a strong, versatile structural material used widely in construction, automotive, and machinery industries.

Carbon Steel: Properties, Production, Examples and Applications

Carbon steel is an iron-carbon alloy, which contains up to 2.1 wt.% carbon. For carbon steels, there is no minimum specified content of other alloying elements, however, they often contain manganese. The maximum manganese, silicon and copper content should be less than 1.65 wt.%, 0.6 wt.% and 0.6 wt.%, respectively.

Types of carbon steel and their properties

Carbon steel can be classified into three categories according to its carbon content: low-carbon steel (or mild-carbon steel), medium-carbon steel and high-carbon steel [1]. Their carbon content, microstructure and properties compare as follows:

Carbon content (wt.%)	Microstructure	Properties	Examples
Low-carbon steel	< 0.25	Ferrite, pearlite	Low hardness and cost. High ductility, toughness, machinability and weldability	AISI 304, ASTM A815, AISI 316L
Medium-carbon steel	0.25 – 0.60	Martensite	Low hardenability, medium strength, ductility and toughness	AISI 409, ASTM A29, SCM435
High-carbon steel	0.60 – 1.25	Pearlite	High hardness, strength, low ductility	AISI 440C, EN 10088-3

Carbon Steel Description

Grade:

1)GB: Q195, Q215, Q235A, Q235B, Q235C, Q235D, Q255A, 255B, Q275, Q295A, Q295B, Q345B, Q345C, Q345D, Q345E, Q390A, Q390B, Q390C,Q390D, Q390E, Q420, Q420B, Q420C, Q420D, Q420E, Q460D, Q460E, Q500D, Q500E, Q550D, Q550E, Q620D, Q620E, Q690D, Q690

2)EN: S185,S235JR, S275JR, S355JR, S420NL, S460NL S500Q, S550Q, S620Q, S690Q

3)ASTM: Grade B, Grade C, Grade D, A36, Grade 36, Grade 40, Grade42, Grade 50, Grade 55, Grade 60, Grade 65, Grade 80

4)JIS: SS330, SPHC, SS400, SPFC, SPHD, SPHE

ПОДРОБНАЯ ИНФОРМАЦИЯ О ПРОДУКТЕ

Place of Origin:	China
Oiled or Non-oiled:	Non-oiled
Alloy Or Not:	Non-Alloy
Tolerance:	±1%
Special Pipe:	Thick Wall Pipe,EMT Pipe
Out Diameter:	10-1500mm
wall thickness	0.4-25mm
Length:	1-12m
Shape:	Round, Square or Rectangular
Itmes:	4 6 12 inch SCH 40 80 black carbon steel pipe
processing service	Bending, Welding, Decoiling, Punching, Cutting
Secondary Or Not:	Non-secondary
technology	hot rolled, cold rolled, black annealed
Keyword:	welded steel pipe
End protector:	Plastic Pipe Cap
Thickness:	0.35 – 100mm
Standard:	API, ASTM, bs, GB, API 5L, ASTM A106-2006,ASTM A53-2007, BS 1387, BS 1139, BS EN10219, GB 3087-1999, GB/T3901,EN, BS, JIS
Technique:	ERW /LSAW/SSAW
Surface Treatment:	Paint oil; Varnish; Galvanized;
Surface Treatment:	Galvanize the raw strip steel;
Certificate:	Bsi, RoHS, SNI, BIS, SASO, SONCAP, sirm, ISO9001,API,ISO
Grade:	10#, 20#, 45#, Q235, Q345, Q195, Q215, ST52,
	ST42, ST35, 10#-45#, Q195-Q345, ST35-ST52
	Q235, Q235B, S275, S275jr, A53, st37, st52
	Q195 → Grade B, SS330,SPHC, S185
	Q215 → Grade C,CS Type B,SS330, SPHC
	Q235 → Grade D,SS400,S235JR,S235JO,S235J2
	Q345 → SS500,ST52
Usage:	mechanical manufacture, construction field,
	metallurgy industry, farm vehicles, agriculture greenhouse,
	automotive industry, railway, highway guardrail,
	container frame, furniture, decoration, steel structure,
	Chemical Fertilizer Pipe,Structure Pipe, Building Construction
package	Standard Seaworthy Packing
	tied with steel trips,then wrapped by plastic material
	or as request
Payment Term:	L/C T/T (30%DEPOSIT)

Standard	Grade	General Size	Delivery Condition
ASTM A36	A36/A36-B	5-20 * 2300-2500 * C	Boron added or Black Condition
ASTM A283	A283-B/A283C	5-20 * 2300-2500 * C	Boron added or Black Condition
ASTM A572	A572Gr50-B/A572Gr42-B	5-20 * 2300-2500 * C	Boron added or Black Condition
ASTM A515	A515Gr70	5-20 * 2300-2500 * C	Boron added or Black Condition
ASTM A516	A516Gr70	5-20 * 2300-2500 * C	Boron added or Black Condition
JIS G 3101	SS400-B	5-20 * 2300-2500 * C	Boron added or Black Condition
JIS G3136	SN400B	5-20 * 2300-2500 * C	Boron added or Black Condition
EN10025-2:2004	S235JR-S355K2+N	5-20 * 2300-2500 * C	Boron added or Black Condition
EN10025-5:2004	S355J2W/S355K2W	5-20 * 2300-2500 * C	Boron added or Black Condition

Material	China	FormerSoviet Union	America	England	Japan	French
Material	GB	ГOCT	ASTM	BS	JIS	NF
High Quality Carbon Structural Steel	08F	08KП	1006	040A04	S09CK
	8	8	1008	045M10	S9CK
	10F		1010	040A10		XC10
	10	10	10,101,012	045M10	S10C	XC10
	15	15	1015	095M15	S15C	XC12
	20	20	1020	050A20	S20C	XC18
	25	25	1025		S25C
	30	30	1030	060A30	S30C	XC32
	35	35	1035	060A35	S35C	XC38TS
	40	40	1040	080A40	S40C	XC38H1
	45	45	1045	080M46	S45C	XC45
	50	50	1050	060A52	S50C	XC48TS
	55	55	1055	070M55	S55C	XC55
	60	60	1060	080A62	S58C	XC55
	15Mn	15Г	10,161,115	080A17	SB46	XC12
	20Mn	20Г	10,211,022	080A20		XC18
	30Mn	30Г	10,301,033	080A32	S30C	XC32
	40Mn	40Г	10,361,040	080a40	S40C	40M5
	45Mn	45Г	10,431,045	080A47	S45C
	50Mn	50Г	10,501,052	030A52080M50	S53C	XC48