GB/T 713.6 Q490DRL2 Steel Plate

GB/T 713.6 Q490DRL2 Steel Plate is quenched-and-tempered high-strength steel plate for pressure equipment under GB/T 713.6-2023, Steel plate, sheet and strip for pressure equipments—Part 6: Quenched and tempered high strength steel (承压设备用钢板和钢带 第6部分：调质高强度钢). The document was published on 6 August 2023, implemented on 1 March 2024, and is current. It replaces GB/T 19189-2011, Quenched and tempered high strength steel plates for pressure vessels, in full.

Clause 4 and Tables 1 and 2 use eight designations: Q490R, Q490DRL1, Q490DRL2, Q490RW, Q580R, Q580DR, Q690R, Q690DR. This page is Q490DRL2. Foreword item b) added 690 MPa and 800 MPa class designations; those classes are the Q580 family (Table 2 tensile 690–820 MPa) and the Q690 family (Table 2 tensile 800–920 MPa). There is no separate Q800R name in Table 1 or Table 2. Captions that write Q490RW as “Q490DRW” or Q690DR as “Q690RDR” are not the clause 4 or table names.

The part applies to quenched-and-tempered high-strength steel plates 10–80 mm thick. Table 2 then limits Q490DRL2 to 10–60 mm, with a minimum yield strength of 490 MPa and a tensile strength of 610–730 MPa. Clause 4 states that L2 represents a −50 °C requirement. Q490DRL2 is therefore the −50 °C member of the 490 MPa family. Plates shall be delivered quenched and tempered, with the tempering temperature not lower than 600 °C. Manufacture shall follow GB/T 713.1 and the steel shall be vacuum treated.

This part is not GB/T 713.2 (specified-temperature non-alloy and alloy steels), not GB/T 713.3, not GB/T 713.4 (nickel steels for specified low-temperature properties) and not ASTM A553. Do not treat a 713.6 designation as a 7 %, 8 % or 9 % nickel plate or copy those impact-specimen rules.

SHH STEEL produces and exports GB/T 713.6 Q490DRL2 Steel Plate to the ordered thickness, tests and documentation. On this site the designation is filed under GB/T 713.6, which the current taxonomy places under Structural Steel Plates.

The items below follow GB/T 713.6-2023. Thickness, width, length and the inspection document are stated on the enquiry rather than listed here as stock or capacity ranges.

The ladle (melt) analysis of Q490DRL2 shall comply with Table 1 of GB/T 713.6-2023. The welding cold-cracking sensitivity index Pcm of that ladle analysis shall also comply with Table 1. Finished-plate chemical deviations follow GB/T 713.1.

Figures are the GB/T 713.6-2023 Table 1 ladle (melt) analysis limits for Q490DRL2, including Pcm (clauses 7.1.1 and 7.1.3). Blank cells in the published table inherit the value above; limits below are expanded for this designation only. Cross-checked mill technical reprints of Table 1: https://www.wusteel.cn/1098/ (2023-11-18), https://www.wusteel.cn/1095/ (2023-11-17), and https://www.wyzhb.com/GB713/2090.html (Xinze/Wuyang dealer page). Not taken from GB/T 19189-2011 (foreword: P and S maxima changed). Official SAMR PDF page images were not obtained on 2026-11-10 Asia/Shanghai; finished-plate chemical deviations still follow GB/T 713.1.

Nickel figures that appear in Table 1 are alloying limits for these quenched-and-tempered high-strength steels. They do not turn this part into GB/T 713.4 nickel low-temperature steel or into ASTM A553. Do not order Q490DRL2 against a 713.4 or A553 chemistry table.

GB/T 713.6-2023 applies to plates 10–80 mm thick. Table 2 then sets the mechanical package for Q490DRL2 at 10–60 mm. When the yield phenomenon is not obvious, Rp0.2 is used. The 180° bend test uses b = 2a and D = 3a. Impact testing is Charpy KV2 in accordance with GB/T 229; three transverse specimens are taken per batch (Table 3). Clause 4 states that L2 represents a −50 °C requirement. Q490DRL2 is therefore the −50 °C member of the 490 MPa family.

Clause 7.4.3: on request and by agreement, plates thicker than 36 mm may have an extra set of impact specimens taken at half-thickness; the energy index is then agreed by both sides. Clause 7.4.4: on request, plates thicker than 36 mm may receive a drop-weight test in accordance with GB/T 6803; quantity, location and acceptance are agreed and written in the contract. Neither extra is automatic, and neither borrows specimen sizes or energy values from GB/T 713.4 or ASTM A553.

Table 3 requires tensile, impact and bend specimens from the same coupon, taken at one-quarter of the plate width, in the transverse direction. If the heat-treated length is not greater than 15 m, the coupon is taken from one end; if it is greater than 15 m, a coupon is taken from each end and each coupon is made into a full set (one tensile, three impact and one bend). Shear or flame cutting of the coupon is allowed if the specimens stay clear of the work-hardened or heat-affected zone. Re-inspection follows GB/T 713.1.

GB/T 713.6-2023 states:

• Manufacture shall comply with GB/T 713.1 and the steel shall be vacuum treated.
• Plates shall be delivered in the quenched-and-tempered condition, with the tempering temperature not lower than 600 °C.
• Surface quality follows GB/T 713.1.
• Ultrasonic testing follows NB/T 47013.3, with acceptance not lower than Level I unless the contract states a special requirement.
• Inspection is by heat-treatment piece (逐热处理张组批).
• Other special requirements may be agreed and written in the contract (7.7).

Do not treat as-rolled or normalized-only supply as the delivery condition of this part. Write any extra half-thickness impact test or drop-weight test for plates thicker than 36 mm on the order; those are agreement items under 7.4.3 and 7.4.4.

We produce and export Q490DRL2 in the specified quenched-and-tempered condition.

Q490DRL2 is intended for welded pressure equipment. A welding procedure should be qualified for the designation, thickness, quenched-and-tempered condition and the service named on the project. This page does not invent preheat temperatures, heat-input caps or hardness limits.

Table 1 specifies a ladle-analysis Pcm limit for the designation. Use the published Table 1 value for Q490DRL2; do not copy a sister row or a GB/T 19189-2011 figure. Consumables and procedure qualification should match the 490 MPa yield / 610–730 MPa tensile package. A procedure written only for GB/T 713.2 carbon or alloy vessel plate, for GB/T 713.4 nickel plate, or for ASTM A553 is not automatically valid.

If repair welding of the plate is not acceptable, or if the purchaser must approve the procedure, the order shall say so.

Dimensions, shape and weight follow GB/T 713.1. This page does not reprint those tables and does not list stock sizes or mill-capacity ranges. Packaging, marking and the quality certificate also follow GB/T 713.1.

Table 3 sampling from the quarter-width coupon, including the 15 m heat-treated-length rule and the need to keep flame-cut specimens out of the heat-affected zone, is a testing rule. It is not a cutting-tolerance table for finished parts.

We produce and export Q490DRL2 to the dimensions and surface requirements agreed on the enquiry.

Q490DRL2 is specified for pressure equipment that names GB/T 713.6 and this designation. The series covers boilers, pressure vessels and related equipment; allowable design stresses, temperature limits and toughness rules come from the construction code or purchaser specification on the project, not from this plate part alone. This page does not publish allowable-stress tables.

This page is not GB/T 713.2 plate, not GB/T 713.4 nickel low-temperature plate, not ASTM A553, not EN 10028-2 carbon high-temperature plate and not ASTM A514 structural quenched-and-tempered plate. The document scope is 10–80 mm; Q490DRL2 itself is limited to 10–60 mm by Table 2.

GB/T 713.6 Q490DRL2 Steel Plate is quenched-and-tempered high-strength pressure-equipment plate under GB/T 713.6-2023, not nickel cryogenic plate and not structural-only QT plate. The comparison uses three products we already publish. They are related by engineering use or similar strength levels, not equivalents. Unpublished GB/T 713.6 sibling designations are not linked here.

Related published ranges: GB/T 713.6, Structural Steel Plates, EN 10028-6, ASTM A514/A514M and EN 10028-2.

The designations below are near names or related national plates, not certified or automatic equivalents. Chemistry, thickness, heat treatment, impact temperature and the required stamp must match the project specification before a substitution is considered. Unpublished GB/T 713.6 siblings are named as plain text only.

• We produce and export GB/T 713.6 Q490DRL2 quenched-and-tempered pressure-equipment plate
• We review the enquiry for the named designation, thickness inside the Table 2 range, and any 7.4.3 or 7.4.4 extras
• We keep this part distinct from GB/T 713.2, from GB/T 713.4 nickel plate and from ASTM A553
• We treat vacuum treatment and quenching and tempering (tempering not below 600 °C) as the specified condition
• We match documentation to what the purchase order requires

Contact SHH STEEL for a quotation for GB/T 713.6 Q490DRL2 quenched-and-tempered pressure-equipment plate. Please include your required quantity, thickness, width and length, delivery destination and preferred delivery schedule so we can review your production and export requirements.

Specify GB/T 713.6-2023 and Q490DRL2. Write any extra half-thickness impact test or drop-weight test required for plates thicker than 36 mm, and name the inspection document required by the project.

If your enquiry compares Q490DRL2 with GB/T 713.2, with GB/T 713.4 nickel plate, with ASTM A553, with EN 10028-6 P690Q, with ASTM A514 Grade B or with EN 10028-2 P265GH, identify each product clearly. We will review the differences in standard, delivery condition and toughness rules rather than assume that similar strength numbers are interchangeable.

For a detailed quotation, email your material specification, quantity and delivery requirements to our team.

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