We has successively developed the high strength plates with yield strength of class 550, 690, 890, 960 and 1100 MPa since 2006, which are mainly used in coal mine machinery, engineering machinery, port machinery, and widely applied in mechanical equipment manufacture including the mining hydraulic support, crane, cement transportation pump, port suspension bridge, etc.
Grade and Size
Grade | Standard | Delivery State | Product Size available | ||
Thickness (mm) | Width (mm) | Length (m) | |||
Q550D Q550E |
Enterprise standard | TMCP | 14~40 | 1000~2800 | ≤16 |
Q690D Q690E |
Enterprise standard | TMCP + tempering | 14~30 | 1000~2800 | ≤16 |
Q550D-QT Q550E-QT |
Enterprise standard | Quenching + tempering | 5~11 | 1000~2500 | ≤13 |
12~80 | 1000~2800 | ≤16 | |||
Q690D-QT Q690E-QT |
Enterprise standard | Quenching + tempering | 5~11 | 1000~2500 | ≤13 |
12~80 | 1000~2800 | ≤16 | |||
Q890D Q890E |
Enterprise standard | Quenching + tempering | 5~11 | 1000~2500 | ≤13 |
12~60 | 1000~2800 | ≤16 | |||
Q960D Q960E |
Enterprise standard | Quenching + tempering | 5~11 | 1000~2500 | ≤13 |
12~60 | 1000~2800 | ≤16 | |||
Q1100D Q1100E |
Enterprise standard | Quenching + tempering | 5~11 | 1000~2500 | ≤13 |
12~30 | 1000~2800 | ≤16 |
S550Q, S550QL, S690Q, S690QL, S890Q, S890QL, S960Q and S960QL have all pass the certification of CE.
2.2 Chemical composition and mechanical properties
Chemical composition of high strength plate (wt %)
Grade | C | Mn | P | S | Si | Nb | Mo | Cr | Ni | B | Ceq |
≤ | |||||||||||
Q550D Q550E |
0.10 | 1.90 | 0.020 | 0.005 | 0.50 | 0.080 | 0.30 | 0.50 | 0.30 | 0.003 | 0.45 |
Q690D Q690E |
0.10 | 1.90 | 0.020 | 0.005 | 0.50 | 0.080 | 0.30 | 0.50 | 0.30 | 0.003 | 0.46 |
Q550D-QT Q550E-QT |
0.18 | 1.60 | 0.018 | 0.007 | 0.50 | 0.050 | 0.50 | 0.80 | 0.80 | 0.0030 | 0.58 |
Q690D-QT Q690E-QT |
0.18 | 1.60 | 0.018 | 0.005 | 0.50 | 0.050 | 0.50 | 0.80 | 0.80 | 0.0030 | 0.62 |
Q890D Q890E |
0.20 | 1.60 | 0.015 | 0.005 | 0.40 | 0.050 | 0.65 | 1.20 | 1.50 | 0.0030 | 0.65 |
Q960D Q960E |
0.20 | 1.60 | 0.015 | 0.005 | 0.40 | 0.050 | 0.65 | 1.20 | 1.50 | 0.0030 | 0.68 |
Q1100D Q1100E |
0.22 | 1.60 | 0.015 | 0.005 | 0.40 | 0.050 | 0.65 | 1.20 | 1.50 | 0.0030 | 0.68 |
Mechanical properties of high strength plate
Grade | Thickness (mm) |
Yield strength (MPa) |
Tensile strength (MPa) |
Elongation ratio A50% |
Elongation ratio A% |
Impact energy |
Q550D Q550E |
14~40 | ≥550 | 670~830 | ≥21 | / | ≥47 |
Q690D Q690E |
16~30 | ≥690 | 780~910 | ≥21 | / | ≥47 |
Q550D-QT Q550E-QT |
5~80 | ≥550 | 670~830 | / | ≥16 | ≥47 |
Q690D-QT Q690E-QT |
5~40 | ≥690 | 780~900 | / | ≥15 | ≥47 |
40~80 | 760~880 | |||||
Q890D Q890E |
5~60 | ≥890 | 940~1050 | / | ≥12 | D: ≥40 E: ≥30 |
Q960D Q960E |
5~50 | ≥960 | 980~1100 | / | ≥11 | D: ≥27 E: ≥27 |
Q1100D Q1100E |
5~30 | ≥1100 | 1250~1500 | / | ≥9 | D: ≥27 E: ≥27 |
Impact temperature:D -20℃;E -40℃; Q -20℃; QL -40℃
2.3 Grade Comparison at home and abroad
NISCO standard | European standard EN 10025-6 |
American standard ASTMA709 |
SSAB | JFE |
Q550D Q550E |
S550Q | / | / | JFE-HITEN690S |
S550QL | ||||
Q690D Q690E |
S690Q | Grade 100 | Weldox 700 | JFE-HITEN780S |
S690QL | ||||
Q890D Q890E |
S890Q | / | Weldox 900 | / |
S890QL | ||||
Q960D Q960E |
S960Q | / | Weldox 960 | JFE-HITEN980S |
S960QL | ||||
Q1100D Q1100E |
/ | / | Weldox 1100 | / |