Reinforcing bar (rebar) grades compared: ASTM A615 / A706, BS 4449 B500, IS 1786 Fe 500D, JIS SD390

Rebar grades are named after their minimum yield strength: Grade 60 (420 MPa) in the USA, B500B or B500C (500 MPa) in the UK and EU, Fe 415 to Fe 600 in India and SD295 to SD490 in Japan. Grades at the same yield level still differ in ductility, so the ductility class (A706, B500C, the D or S suffix in IS 1786) matters as much as the number.

Cross-reference

Equivalent grades by region

Level	USAASTM A615, ASTM A706	UKBS 4449	EUEN 10080 with national standards (e.g. DIN 488); ductility classes in EN 1992-1-1 Annex C	IndeIS 1786	JapanJIS G 3112
~280–295 MPa yield	ASTM A615 Grade 40 [280] (tensile ≥60 ksi / 420 MPa)	—	—	—	SD295 (yield ≥295 MPa, tensile 440–600 MPa)
~345 MPa yieldSD345 has no direct counterpart elsewhere; it falls between Grade 40 and Grade 60.	—	—	—	—	SD345 (yield 345–440 MPa, tensile ≥490 MPa)
~390–420 MPa yieldGrade 60 (420 MPa) and Fe 415 are the closest pair. SD390 is slightly lower in yield.	ASTM A615 Grade 60 [420] (tensile ≥90 ksi / 620 MPa); ASTM A706 Grade 60 [420] (yield 60–78 ksi, tensile ≥80 ksi / 550 MPa)	—	—	Fe 415 / Fe 415D / Fe 415S (yield ≥415 MPa; tensile ≥485 / 500 MPa for Fe 415 / 415D)	SD390 (yield 390–510 MPa, tensile ≥560 MPa)
~490–520 MPa yieldThe 2025 scope of ASTM A615 lists Grades 40, 60, 80 and 100; Grade 75 appears in earlier editions.	— (A615 Grade 75 [520] in editions that include it is the closest)	B500A / B500B / B500C (yield 500 MPa)	B500A / B500B / B500C (yield 500 MPa)	Fe 500 / Fe 500D / Fe 500S (yield ≥500 MPa; tensile ≥545 / 565 MPa for Fe 500 / 500D)	SD490 (yield 490–625 MPa, tensile ≥620 MPa)
~550 MPa yield	ASTM A615 Grade 80 [550] (tensile ≥105 ksi / 725 MPa); ASTM A706 Grade 80 [550] (yield 80–98 ksi, tensile ≥100 ksi / 690 MPa)	—	—	Fe 550 / Fe 550D (yield ≥550 MPa; tensile ≥585 / 600 MPa)	—
~600–690 MPa yieldJapanese 590–685 MPa bars (USD590, USD685) are approved by the Ministry of Land, Infrastructure, Transport and Tourism rather than listed in JIS G 3112.	ASTM A615 Grade 100 [690]; ASTM A706 Grade 100 [690] (added 2022)	—	—	Fe 600 (yield ≥600 MPa, tensile ≥660 MPa)	—
High-ductility / seismic designationEach system controls seismic ductility differently: a separate spec (A706), a ductility class (B500C), a suffix (D, S) or a capped yield range (SD grades).	ASTM A706 (low-alloy, weldable, tensile ≥1.25 × actual yield)	B500C (Rm/Re 1.15–<1.35, Agt ≥7.5 %)	B500C (ductility class C)	Fe 415S / Fe 500S (yield capped at 540 / 625 MPa, TS/YS ≥1.25, Agt ≥10 / 8 %); D grades (Agt ≥5 %)	SD345–SD490 (upper yield limit, yield ratio ≤80 %)

Read before comparing

Grades are compared by specified minimum yield (or 0.2 % proof) strength. ASTM grade numbers are in ksi with the MPa grade in brackets (Grade 60 [420]); IS 1786, BS 4449 and JIS numbers are in MPa.
Ductility classes A, B and C (BS 4449 and EN 1992-1-1 Annex C) are set by the tensile-to-yield ratio Rm/Re and the total elongation at maximum force Agt: A ≥1.05 and ≥2.5 %, B ≥1.08 and ≥5.0 %, C 1.15–<1.35 and ≥7.5 % (characteristic values).
In IS 1786 the D suffix keeps the same yield as the base grade but raises elongation (Fe 500: 12 %, Fe 500D: 16 %) and requires Agt ≥5 %. The S grades, added by amendment, cap the yield and require TS/YS ≥1.25.
EN 10080 sets general requirements for weldable reinforcing steel but does not itself define B500 grades. The grades and ductility classes come from national standards (BS 4449, DIN 488 and others) and Eurocode 2.
Fe 415 is close to ASTM Grade 60 and Fe 500 to B500, but elongation measures differ (gauge lengths and Agt rules), so a bar certified to one standard is not automatically compliant with another.
Japanese SD grades specify both a lower and an upper yield limit (for SD345 and above) and a maximum yield ratio of 80 %, which acts as a ductility control.

Questions et réponses

Common questions

Is Fe 500D the same as B500B?

They share a 500 MPa minimum yield but are not identical. Fe 500D (IS 1786) requires tensile strength at least 1.10 × yield and not below 565 MPa, 16 % elongation and Agt ≥5 %. B500B (BS 4449) requires Rm/Re ≥1.08 and Agt ≥5.0 %. They are close equivalents; B500C is the higher-ductility class.

What is the US equivalent of Fe 415 or Fe 500?

Fe 415 (415 MPa yield) is closest to ASTM A615 Grade 60 [420]. Fe 500 has no exact US match: Grade 60 is lower and Grade 80 [550] is higher; Grade 75 [520], in editions that list it, is the nearest.

What is the equivalent of JIS SD390 or SD490?

SD390 (390 MPa minimum yield) is closest to ASTM Grade 60 and IS 1786 Fe 415. SD490 (490 MPa minimum yield) is closest to B500 and Fe 500. SD grades also set a maximum yield, which most other systems do not.

What is the difference between ASTM A615 and A706 rebar?

A615 is plain carbon-steel deformed bar. A706 is low-alloy bar with controlled chemistry for welding, a capped yield range and a tensile strength of at least 1.25 × the actual yield, which is why it is used in seismic design.

What do the A, B and C in B500A, B500B and B500C mean?

They are ductility classes. All three have a 500 MPa characteristic yield; C has the highest required strain at maximum force (7.5 %) and strength ratio (1.15–1.35), B is mid (5.0 %, 1.08) and A is the lowest (2.5 %, 1.05).

From the Corona catalog

Need a part made to this specification?

Send the drawing, the material or grade, the finish, the quantity and the delivery country. The team reviews the requirement and the manufacturing route.

Démarrer une demande

Keep reading

References

Sources

Values summarize published limits and typical data. The governing standard and the current edition control; check them before specifying.