🟦 Product Overview

A572 and S355JR Structural Steel Bars are high‑strength low‑alloy (HSLA) steels designed for:

• Structural engineering
• Construction frameworks
• Machinery components
• Heavy equipment
• Bridges & infrastructure

These grades offer:

• High yield strength
• Excellent toughness
• Good weldability
• Superior performance under dynamic loads

A572 (ASTM) and S355JR (EN) are internationally equivalent structural steel grades, widely used in global engineering projects.

🟦 Standards

• ASTM A572 (Grade 50 / 55 / 60)
• EN 10025‑2 (S355JR)
• ASTM A29 (General bar requirements)
• GB / JIS equivalents available

🟦 Grades Included

• A572 — High‑strength structural steel (Grade 50 most common)
• S355JR — EN structural steel with excellent toughness

🟦 Product Specifications & Available Sizes

Shapes Available

• Round Bar
• Square Bar
• Flat Bar
• Hex Bar

Diameter Range

• 10–800 mm

Length

• 1–12 m / custom cut

Surface Conditions

• Hot Rolled
• Cold Drawn
• Peeled / Turned
• Polished

🟦 Chemical Composition Comparison

Grade	C (%)	Mn (%)	Si (%)	P (%)	S (%)
A572	≤ 0.23	1.35	≤ 0.40	≤ 0.040	≤ 0.050
S355JR	≤ 0.24	1.60	≤ 0.55	≤ 0.040	≤ 0.040

🟦 Mechanical Properties Comparison

Grade	Tensile Strength	Yield Strength	Elongation	Impact Test
A572 Grade 50	450–620 MPa	≥ 345 MPa	≥ 18%	—
S355JR	470–630 MPa	≥ 355 MPa	≥ 22%	27 J @ +20°C

🟦 Physical Properties

Property	Value
Density	7.85 g/cm³
Melting Point	~1450°C
Magnetic	Yes

🟦 Manufacturing Processes

• Hot Rolling
• Cold Drawing
• Turning / Peeling
• Grinding / Polishing
• Straightening
• Ultrasonic Testing

🟦 Primary Industry Usage

• Construction & building structures
• Machinery & equipment
• Bridges & infrastructure
• Steel frameworks
• Heavy engineering
• Load‑bearing components

🟦 Why Use Structural Steel Bar

• High yield strength
• Excellent toughness
• Good weldability
• Reliable performance under dynamic loads
• Ideal for structural and mechanical applications

🟦 Why Choose WelSteels

• Full range of A572 / S355JR
• Hot rolled & cold drawn options
• MTC 3.1 + third‑party inspection
• Export‑grade packaging
• Competitive pricing for global projects

International Carbon Steel Grade

America	Japan	Germany		Britain		France	Italy	Spain	Switzerland	China
AISI/SAE	JIS	W‐nr.	DIN	BS	EN	AFNOR	UNI	UNE	SS	GB
A570.36	STKM 12A	1.0038	RSt.37‐2	4360	‐	E 24‐2	‐	‐	1311	15
–	STKM 12C	–	–	40 C	–	Ne	–	–	–	–
1015	‐	1.0401	C15	080M15	‐	CC12	C15, C16	F.111	1350	15
1020	‐	1.0402	C22	050A20	2C	CC20	C20, C21	F.112	1450	20
1213	SUM22	1.0715	9SMn28	230M07	1A	S250	CF9SMn28	F.2111	1912	Y15
								11SMn28
12L13	SUM22L	1.0718	9SMnPb28	‐	‐	S250Pb	CF9SMnPb28	11SMnPb28	1914	‐
‐	‐	1.0722	10SPb20	‐	‐	10PbF2	CF10Pb20	10SPb20	‐	‐
1215	‐	1.0736	9SMn36	240M07	1B	S300	CF9SMn36	12SMn35	‐	Y13
12L14	‐	1.0737	9SMnPb36	‐	‐	S300PB	CF9SMnPb36	12SMnP35	1926	‐
1015	S15C	1.1141	Ck15	080M15	32C	XC12	C16	C15K	1370	15
1025	S25C	1.1158	Ck25	‐	‐	‐	‐	‐	‐	25
A572-60	‐	1.890	StE380	4360 55	‐	‐	FeE390KG	‐	2145	‐
1035	‐	1.0501	C35	060A35	‐	CC35	C35	F.113	1550	35
1045	‐	1.0503	C45	080M46	‐	CC45	C45	F.114	1650	45
1140	‐	1.0726	35S20	212M36	8M	35MF4	‐	F210G	1957	‐
1039	‐	1.1157	40Mn4	150M36	15	35M5	‐	‐	‐	40Mn
1335	SMn438(H)	1.1167	36Mn5	‐	‐	40M5	‐	36Mn5	2120	35Mn2
1330	SCMn1	1.1170	28Mn6	150M28	14A	20M5	C28Mn	‐	‐	30Mn
1035	S35C	1.1183	Cf35	060A35	‐	XC38TS	C36	‐	1572	35Mn
1045	S45C	1.1191	Ck45	080M46	‐	XC42	C45	C45K	1672	Ck45
1050	S50C	1.1213	Cf53	060A52	‐	XC48TS	C53	‐	1674	50
1055	‐	1.0535	C55	070M55	9	‐	C55	‐	1655	55
1060	‐	1.0601	C60	080A62	43D	CC55	C60	‐	‐	60
1055	S55C	1.1203	Ck55	070M55	‐	XC55	C50	C55K	‐	55
1060	S58C	1.1221	Ck60	080A62	43D	XC60	C60	‐	1678	60Mn
1095	‐	1.1274	Ck101	060A96	‐	XC100	‐	F.5117	1870	‐
W1	SK3	1.1545	C105W1	BW1A	‐	Y105	C36KU	F.5118	1880	‐
W210	SUP4	1.1545	C105W1	BW2	‐	Y120	C120KU	F.515	2900	‐