Steel Grades – COJIASTEEL

G450 Steel

cosasteel — Thu, 02 Nov 2023 03:17:27 +0000

G450 steel is a structural steel grade according to the Australian AS 1397 standard. Its minimum yield strength is 450 MPa and the carbon content is 0.2, which is a low-carbon steel. When using steel in the construction field, pay attention to the yield strength. The steel will deform when it is higher than 450 MPa.

G450 steel can be applied to Z, ZF, ZA, ZM, AZ, AM hot dip metallic coatings.

G450 Requirements for Chemical Composition

Steel grade designation AS 1397	Chemical composition (cast analysis), % max.
	Carbon	Manganese	Phosphorus	Sulfur
G450	0.2	1.2	0.04	0.03

G450 Mechanical property requirements

Steel grade designation	Longitudinal tensile test				Transverse bend test
	Min. yield strength MPa	min. tensile strength MPa	Min.elongation,%		Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
	Min. yield strength MPa	min. tensile strength MPa	Lo = 50 mm	Lo = 80 mm	Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
G450	450	480	10	9	90	4t

G450 Coating Adhesion (180° bend test) requirements

Steel grade designation	Diameter of mandrel in terms of thickness of product (t)
	Coating class
	"Z", "ZA", "ZF" and "ZM"						"AZ" and "AM"
	Z100, ZA90 ZF80 ZF100	Z200, ZA135, ZA180, ZM90, ZM120, ZM150, ZM180	Z275, ZA225, ZA275, ZM220, ZM275	Z350, ZA350, ZM350	Z450, ZA450, ZM450	Z600	AZ150, AM100, AM125, AM150	AZ200, AM175, AM200 AM225
G450	0	t	2t	2t	2t	3t	2t	2t

G350 Steel

cosasteel — Thu, 02 Nov 2023 03:16:20 +0000

G350 steel is a structural steel grade to the Australian AS 1397 standard, which is the base material for hot-dip metallic coated steel. Its minimum yield strength is 350 MPa, suitable for roofs and light steel structures.

G350 steel can be applied to a variety of hot dip coatings:

Zinc coating (Z).

Zinc coating converted to zinc/iron alloy (ZF).

Zinc/aluminium (ZA).

Zinc/aluminium/magnesium (ZM).

Aluminium/zinc (AZ)

Aluminium/zinc/magnesium (AM).

G350 Requirements for Chemical Composition

Steel grade designation AS 1397	Chemical composition (cast analysis), % max.
	Carbon	Manganese	Phosphorus	Sulfur
G350	0.3	1.6	0.1	0.035

G350 Mechanical property requirements

Steel grade designation	Longitudinal tensile test				Transverse bend test
	Min. yield strength MPa	min. tensile strength MPa	Min.elongation,%		Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
	Min. yield strength MPa	min. tensile strength MPa	Lo = 50 mm	Lo = 80 mm	Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
G350	350	420	15	14	180	2t

G350 Coating Adhesion (180° bend test) requirements

Steel grade designation	Diameter of mandrel in terms of thickness of product (t)
	Coating class
	"Z", "ZA", "ZF" and "ZM"						"AZ" and "AM"
	Z100, ZA90 ZF80 ZF100	Z200, ZA135, ZA180, ZM90, ZM120, ZM150, ZM180	Z275, ZA225, ZA275, ZM220, ZM275	Z350, ZA350, ZM350	Z450, ZA450, ZM450	Z600	AZ150, AM100, AM125, AM150	AZ200, AM175, AM200 AM225
G350	0	0	t	t	t	2t	t	t

G250 Steel

cosasteel — Thu, 02 Nov 2023 02:51:08 +0000

G250 steel is a structural steel grade according to the Australian AS 1397 standard. Its yield strength is 250 MPa and its carbon content is 0.12. It comes in two styles sheet and coil.

G250 steel is a kind of low-carbon structural steel, which is used in metal roofs, walls, purlins, etc. It has good weldability.

G250 Requirements for Chemical Composition

Steel grade designation AS 1397	Chemical composition (cast analysis), % max.
	Carbon	Manganese	Phosphorus	Sulfur
G250	0.12	0.5	0.04	0.035

G250 Mechanical property requirements

Steel grade designation	Longitudinal tensile test				Transverse bend test
	Min. yield strength MPa	min. tensile strength MPa	Min.elongation,%		Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
	Min. yield strength MPa	min. tensile strength MPa	Lo = 50 mm	Lo = 80 mm	Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
G250	250	320	25	22	180	0

G250 Coating Adhesion (180° bend test) requirements

Steel grade designation	Diameter of mandrel in terms of thickness of product (t)
	Coating class
	"Z", "ZA", "ZF" and "ZM"						"AZ" and "AM"
	Z100, ZA90 ZF80 ZF100	Z200, ZA135, ZA180, ZM90, ZM120, ZM150, ZM180	Z275, ZA225, ZA275, ZM220, ZM275	Z350, ZA350, ZM350	Z450, ZA450, ZM450	Z600	AZ150, AM100, AM125, AM150	AZ200, AM175, AM200 AM225
G250	0	0	0	0	t	2t	0	t

G300 Steel

cosasteel — Mon, 29 May 2023 03:32:10 +0000

G300 steel is a Metallic Coated structural steel in the AS 1397 standard, and the minimum yield strength is 300 MPa. G300 steel is used for roofing, cladding and light steel structure.

The common hot-dip metallic coated of G300 steel is ZINCALUME® and galvanized.

G300 Requirements for chemical composition

Steel grade designation AS 1397	Chemical composition (cast analysis), % max.
	Carbon	Manganese	Phosphorus	Sulfur
G300	0.3	1.6	0.1	0.035

G300 Mechanical property requirements

Steel grade designation	Longitudinal tensile test				Transverse bend test
	Min. yield strength MPa	min. tensile strength MPa	Min.elongation,%		Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
	Min. yield strength MPa	min. tensile strength MPa	Lo = 50 mm	Lo = 80 mm	Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
G300	300	340	20	18	180	t

G300 Coating Adhesion (180° bend test) requirements

Steel grade designation	Diameter of mandrel in terms of thickness of product (t)
	Coating class
	"Z", "ZA", "ZF" and "ZM"						"AZ" and "AM"
	Z100, ZA90 ZF80 ZF100	Z200, ZA135, ZA180, ZM90, ZM120, ZM150, ZM180	Z275, ZA225, ZA275, ZM220, ZM275	Z350, ZA350, ZM350	Z450, ZA450, ZM450	Z600	AZ150, AM100, AM125, AM150	AZ200, AM175, AM200 AM225
G300	0	0	t	t	t	2t	t	t

G550 Steel

cosasteel — Mon, 17 Apr 2023 10:20:11 +0000

G550 steel is a structural steel grade in the Australian AS 1397 (Continuous hot-dip metallic coated steel sheet and strip) standard. G550 means that the minimum yield strength is 550MPa.

G550 steel can provide the following hot-dip coatings:

Zinc coating (Z).

Zinc coating converted to zinc/iron alloy (ZF).

Zinc/aluminium (ZA).

Zinc/aluminium/magnesium (ZM).

Aluminium/zinc (AZ)

Aluminium/zinc/magnesium (AM).

G550 Requirements for Chemical Composition

Steel grade designation AS 1397	Chemical composition (cast analysis), % max.
	Carbon	Manganese	Phosphorus	Sulfur
G550	0.2	1.2	0.04	0.03

G550 Mechanical Property Requirements

Steel grade designation	Longitudinal tensile test				Transverse bend test
	Min. yield strength MPa	min. tensile strength MPa	Min.elongation,%		Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
	Min. yield strength MPa	min. tensile strength MPa	Lo = 50 mm	Lo = 80 mm	Angle of bend degrees	Diameter of mandrel in terms of test piece thickness (t)
G550	550	550	2	2	—	—

G550 Coating Adhesion (180° bend test) requirements

Steel grade designation	Diameter of mandrel in terms of thickness of product (t)
	Coating class
	"Z", "ZA", "ZF" and "ZM"						"AZ" and "AM"
	Z100, ZA90 ZF80 ZF100	Z200, ZA135, ZA180, ZM90, ZM120, ZM150, ZM180	Z275, ZA225, ZA275, ZM220, ZM275	Z350, ZA350, ZM350	Z450, ZA450, ZM450	Z600	AZ150, AM100, AM125, AM150	AZ200, AM175, AM200 AM225
G550	t	2t	2t	2t	2t	3t	2t	2t

G550 Steel equivalent

Standard	Grade
EN 10346	S550GD
ASTM A653	SS550
JIS G 3302	SGC550

Use of G550 Steel

Roofing,
Cladding,
Roll-formed sections for structural applications

S550GD

emma — Wed, 30 Mar 2022 07:50:10 +0000

Definition

Structural steel (non-alloyed high-grade steel) S550GD is a structural steel with a yield point of 550 N/mm², which has excellent corrosion resistance, forming, coating and other properties.

S550GD is available with the following hot dip coatings: S550GD+Z (galvanized), S550GD+ZF (galvanized-iron), S550GD+ZA (galvanized-aluminum), S550GD+AZ (aluminum-zinc)

Chemical Composition Of S550GD (Casting Analysis)

Designation			Chemical composition % by mass max.
Steel grade		Symbols for the types of available coatings	C	Si	Mn	P	S
Steel name	Steel number
S550GD	1.0531	+Z,+ZF,+ZA,+ZM,+AZ	0,20	0,60	1,70	0,10	0,045

Mechanical Properties Of S550GD (Longitudinal)

Designation			Mechanical properties
Steel grade		Symbols for the types of available coatings	Proof strength Rp0,2 a MPad min.	Tensile strength Rm b MPad min.	Elongation A80 c % min.
Steel name	Steel number
S550GD	1.0531	+Z,+ZF,+ZA,+ZM, +AZ	550	560	-

Equivalent material (for reference only)

ASTM SS250, ASTM SS255, ASTM SS275, ASTM HTS, DIN ST50, DIN S550GD, ISO 550, DIN 1.0531, etc.

Application

Can be used in the field of construction: building panels, buildings, steel plates and bridges, in the field of factories and machinery: strips, equipment belts, factory infrastructure, household goods, furniture, ships, automobile production, etc.

S390GD

emma — Wed, 30 Mar 2022 06:09:20 +0000

Definition

Steel grade S390GD is a structural steel formulated according to standard DIN specifications and hot-dip galvanized strip and sheet classification. As a high-tech, high-value-added product, S390Gd is widely used at home and abroad.

Characteristic

S390GD belongs to Steel, Sheet and Strip, Coated, Continuous Hot Dip Coated Strip and Sheet (EN), values are available for 0.2% Yield Point [MPa], Nominal Dimensions [mm], Tensile Strength [MPa], Elongation at break A80 [%] in the range (20;20)°C

Chemical Composition Of S390GD (Casting Analysis)

Designation			Chemical composition % by mass max.
Steel grade		Symbols for the types of available coatings	C	Si	Mn	P	S
Steel name	Steel number
S390GD	1.0238	+Z,+ZF,+ZA,+ZM,+AZ	0,20	0,60	1,70	0,10	0,045

Mechanical Properties Of S390GD (Longitudinal)

Designation			Mechanical properties
Steel grade		Symbols for the types of available coatings	Proof strength Rp0,2 a MPad min.	Tensile strength Rm b MPad min.	Elongation A80 c % min.
Steel name	Steel number
S390GD	1.0238	+Z,+ZF,+ZA, +ZM, +AZ	390	460	16

S390gd equivalent material (for reference only)

DIN 1.0238, EN 1.0238

Application industry

The S390GD steel grade is commonly used for its good cold formability and sufficient tensile strength values
Construction: Structural or non-structural profiles, roofs
Road and Rail Infrastructure: Safety Barriers, Protection and Acoustic Wall Panels
Agriculture and Agriculture
solar energy generation
Tubular applications: for scaffolding, road signs, etc.

S320GD

emma — Tue, 29 Mar 2022 07:56:54 +0000

Grade S320GD is structural steel with a yield strength of at least 320 MPa. S320GD is available in the following hot dip coatings: S320GD+Z (galvanized), S320GD+ZF (galvanized-iron), S320GD+ZA (galvanized-aluminum), S320GD+AZ (aluminum-zinc), S320GD+AS (galvanized-iron) aluminum silicon).

Features

1) Applies to upper yield strength ReH.
2) Except for S550GD steel grade, the span of tensile strength is 140 MPa.
3) Depending on the product thickness, the minimum elongation at break decreases as follows: 0.50 mm < t < 0.70 mm (minus 2 units), 0.35 mm < t < 0.50 mm (minus 4 units) and t < 0.35 mm (minus 7 units) units).

Chemical Composition Of S320GD (Casting Analysis)

Designation			Chemical composition % by mass max.
Steel grade		Symbols for the types of available coatings	C	Si	Mn	P	S
Steel name	Steel number
S320GD	1.0250	+Z,+ZF,+ZA,+ZM,+AZ,+AS	0,20	0,60	1,70	0,10	0,045

Mechanical Properties Of S320GD (Longitudinal)

Designation			Mechanical properties
Steel grade		Symbols for the types of available coatings	Proof strength Rp0,2 a MPad min.	Tensile strength Rm b MPad	Elongation A80 c % min.
S320GD	1.0250	+Z,+ZF,+ZA,+ZM,+AZ,+AS	320	390	17

Equivalent material (for reference only)

ASTM SS255, ASTM SS275, ASTM SS250, ASTM SS550, etc.

Types of S320GD+Z galvanized sheet

Hot dip galvanized steel sheet
Alloyed galvanized steel sheet
Electro-galvanized steel sheet
Single-sided and double-sided differential galvanized steel
Alloy, composite galvanized steel sheet

S280GD

emma — Tue, 29 Mar 2022 06:08:00 +0000

Definition

The S280GD grade is a structural steel with a yield point of at least 280 MPa.

S280GD is available in the following hot dip coatings: S280GD+Z (galvanized), S280GD+ZF (galvanized-iron), S280GD+ZA (galvanized-aluminum), S280GD+AZ (aluminum-zinc), S280GD+AS (galvanized-iron) aluminum silicon).

Characteristic

Good heat resistance.
The economy is relatively high.
Corrosion resistance.
High thermal reflectivity, can be used as thermal insulation material.

Chemical composition of S280GD (casting analysis)

Designation			Chemical composition % by mass max.
Steel grade		Symbols for the types of available coatings	C	Si	Mn	P	S
Steel name	Steel number
S280GD	1.0244	+Z,+ZF,+ZA,+ZM,+AZ,+AS	0,20	0,60	1,70	0,10	0,045

Mechanical properties of S280GD (longitudinal)

Designation			Mechanical properties
Steel grade		Symbols for the types of available coatings	Proof strength Rp0,2 a MPad min.	Tensile strength Rm b MPad min.	Elongation A80 c % min.
Steel name	Steel number
S280GD	1.0244	+Z,+ZF,+ZA, +ZM, +AZ,+AS	280	360	18

S280GD Z275

S280GD Galvanized Steel Coil with Zinc Weight Z275.

S280gd equivalent material (for reference only)

AFNOR C.280, BS Z28, ASTM SS230, ASTM SS255, ASTM SS275, ASTM SS250, DIN 1.0244, EN 1.0244, etc.

Application industry

Architecture: Roofs, plumbing and modular houses.
Automotive: mufflers, exhaust pipes, wiper parts, fuel tanks, etc.
Home appliances: refrigerator back cover, gas stove, air conditioner, LED backlight, electrical cabinet, etc.
Agriculture: pigs, chicken houses, barns, pipes, etc. Greenhouses
Others: thermal insulation cover, heat exchanger, dryer, water heater, etc.

S220GD

emma — Mon, 28 Mar 2022 05:47:33 +0000

S220GD Definition

S220GD is a continuous hot dip coating cold-rolled steel sheet product, which can support the following hot dip coatings: S220GD+Z (coating Zn), S220GD+ZF (coating Zn-Fe), S220GD+ZA (coating Zn-Al), S220GD+AZ ( galvanized).

Advantage

This series of products have high strength and strong deformation ability, as well as good adhesion and welding performance, and have strong corrosion resistance and smooth surface and beautiful appearance, generally can be used for surface building materials or structures pieces, etc.

Chemical composition of S220GD (casting analysis)

Designation			Chemical composition % by mass max.
Steel grade		Symbols for the types of available coatings	C	Si	Mn	P	S
Steel name	Steel number
S220GD	1.0241	+Z,+ZF,+ZA,+ZM,+AZ	0,20	0,60	1,70	0,10	0,045

Mechanical properties of S220GD (longitudinal)

Designation			Mechanical properties
Steel grade		Symbols for the types of available coatings	Proof strength Rp0,2 a MPad min.	Tensile strength Rm b MPad min.	Elongation A80 c % min.
Steel name	Steel number
S220GD	1.0241	+Z,+ZF,+ZA, +ZM, +AZ	220	300	20

S220GD Z275

S220GD Galvanized Steel Coil with Zinc Weight Z275.

S220gd equivalent material (for reference only)

ASTM SS230, ASTM SS255, ASTM SS275, ASTM SS250, DIN 1.0241, DIN Fe E220G, DIN S220GD, etc.

Scope of use

Solar energy, machinery manufacturing, elevators, metal products, pressure vessels, nuclear power, chemical equipment, household appliances, edible machinery, rail transit, structural pipe making, architectural decoration, automotive, catering kitchen utensils, precision electronics, containers, sanitary ware, household Electrical appliances and other industries.