15B25M · Q/BQB 517-2023. Delivery condition, dimensions, mechanical properties, hardenability and acceptance must be confirmed against the applicable standard and order agreement. Similar grades are not interchangeable; this page does not guarantee supply or forming performance.
Baosteel agreement / special grade: a national or international standard designation for this complete name has not been confirmed. Approximate cross-references are not equivalence.
Baosteel delivery specification: Q/BQB 517-2023
The values below come from the identified Baosteel standard or agreement, not from a general national-standard chemistry table. Different sources are shown separately and their limits are not combined.
Chemical composition (mass fraction, %)
Q/BQB 517-2023 · PDF 10 · Table 1 · Row 55
C
Si
Mn
P
S
Cr
Mo
B
Alt
Other
0.23-0.28
≤0.35
0.90-1.20
≤0.020
≤0.020
≤0.40
—
0.0005-0.0030
—
Ni：≤0.25Cu：≤0.30Ti/N：≥3.5
Delivery condition, dimensions, mechanical properties, hardenability and acceptance must be confirmed against the applicable standard and order agreement. Similar grades are not interchangeable; this page does not guarantee supply or forming performance.
Illustrative product photograph randomly selected from company photos; it does not identify this grade, heat or batch.
TECHNICAL NOTE
Application and ordering note
Chemical composition, mechanical properties, delivery condition and other technical requirements are subject to the currently applicable standard edition, customer drawings and the order technical agreement. Website information does not replace formal quality certification documents.
RFQ CHECKLIST
What to include in the enquiry
Grade and applicable standard
Diameter or section, delivery condition and quantity
Part drawing, forming stations or failure photos, if available
Testing, certificate or report requirements
RELATED CAPABILITIES
Related manufacturing and quality capabilities
Carbon equivalent calculator — 15B25M
Basis: Q/BQB 517-2023
Chemical composition source: Original standard not yet verified
Original standard not yet verified
A stated upper limit means 0 to that limit. A lower limit alone does not define an upper bound. Missing elements are unknown, not zero. Standard-limit combinations are not measured heat results.
Carbon equivalent supports weldability assessment; it does not approve cold heading, fastener strength or a welding procedure. These formulas do not directly apply to stainless steels, cast irons or non-ferrous metals.
