GB/T 19189 07MnMoVR Steel Plate | 07MnMoVR -20°C QT Vessel Plate (Now Q490R)

GB/T 19189 07MnMoVR Steel Plate is low weld-crack-sensitivity Mn-Mo-V steel, supplied quenched and tempered for welded pressure vessels under GB/T 19189-2011. The suffix R stands for pressure vessel (rong) and D for low temperature (di) in the Chinese designation system; the leading 07 or 12 indicates the nominal carbon level.

GB/T 19189-2011, Quenched and tempered high strength steel plates for pressure vessels, was issued on 16 June 2011 (as GB 19189-2011) and implemented on 1 February 2012, replacing the 2003 edition. It has since been fully replaced by GB/T 713.6-2023, Steel plate, sheet and strip for pressure equipment – Part 6: Quenched and tempered high strength steel, implemented on 1 March 2024. GB/T 19189-2011 is therefore a superseded standard and is not the current Chinese specification for this plate.

The documented successor of 07MnMoVR is GB/T 713.6 Q490R Steel Plate: the GB/T 150-2024 errata replace the material 07MnMoVR / GB/T 19189 with Q490R / GB/T 713.6 in the vessel code tables. The 2023 book renamed the grades by yield strength and changed the phosphorus and sulfur maxima, so the two are related designations, not the same specification. New designs should be ordered to GB/T 713.6-2023; this page is for drawings, data sheets and replacement records that still call for GB/T 19189-2011.

SHH STEEL produces and exports 07MnMoVR plate to the edition, thickness, impact and inspection requirements written on the enquiry. The grade sits in our GB/T 19189 range under Boiler & Pressure Vessel Steel Plates.

The items below follow GB/T 19189-2011. Thickness, width, length and inspection document are confirmed against the enquiry rather than listed as stock ranges.

The heat analysis below is the 07MnMoVR row of GB/T 19189-2011 Table 1. Pcm is the weld crack sensitivity composition, Pcm = C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/15 + V/10 + 5B (%).

Clause 6.1.3 removes the molybdenum lower limit for thinner 07MnMoVR plate (36 mm and below in the published extracts of the 2011 text); confirm the exact thickness against the 2011 edition text if the order relies on it. Micro-alloying elements other than those listed may be added to improve properties (clause 6.1.2). Product analysis tolerances follow GB/T 222, with phosphorus +0.003 % and sulfur +0.002 % (clause 6.1.4).

These are 2011 values. GB/T 713.6-2023 changed the phosphorus and sulfur maxima, so the 2011 row must not be used as a Q490R chemistry, and the Q490R table must not be used for a 2011 order.

Table 2 of GB/T 19189-2011 sets one property band for 07MnMoVR across its thickness range.

Where yield is not distinct, Rp0.2 is used. Charpy energy is the mean of three specimens; one value may be below the Table 2 figure but not below 70 % of it. Plate under 12 mm is tested with 7.5 × 10 × 55 mm sub-size specimens, with results not less than 75 % of the Table 2 value. By agreement, plate over 36 mm may receive an extra impact set at mid-thickness, with the energy agreed between the parties (clause 6.4.4).

If an impact result fails, three more specimens are taken from the same plate; the mean of all six must meet the requirement, no more than two may be below it, and only one may be below 70 % of it.

Plates are delivered in the quenched-and-tempered condition, with tempering at not less than 600°C, and are cut by shearing or flame cutting. As-rolled, normalized or TMCP plate is not a GB/T 19189-2011 delivery condition.

The mechanical values apply to the QT condition supplied. If the vessel will receive post-weld heat treatment, the PWHT cycle and any simulated PWHT testing should be written on the order, because PWHT can lower strength in QT steels.

07MnMoVR is one of the three low weld-crack-sensitivity grades of the 2011 book. The Pcm ceiling in Table 1 limits the hardenability that drives hydrogen cracking, which helps reduce preheat on thick QT plate.

Preheat, interpass temperature, heat input and any PWHT are set by the qualified procedure, the thickness and the vessel code, not by the grade name. Excessive heat input can soften or embrittle the HAZ of QT steel, so procedures should be qualified with impact tests at the vessel test temperature.

Dimensions, shape and permitted deviations follow GB/T 709; thickness tolerance is Class B unless Class C is agreed. Plates are invoiced on theoretical weight using the mean of the maximum and minimum permitted thickness.

Cracks, blisters, scabs, folds, inclusions and laminations are not permitted. Surface defects may be dressed to a depth of not more than half the thickness tolerance, keeping the minimum thickness, with smooth dressed areas.

Each heat-treated plate is inspected as its own batch. Per heat: one chemical analysis. Per batch: one tensile, three Charpy and one bend specimen, all transverse, taken at quarter width; plates longer than 15 m after heat treatment are sampled at both ends. For plate over 25 mm the impact specimen axis is at quarter thickness. Every plate is ultrasonically tested to level I.

We produce and export 07MnMoVR for room-temperature and moderately cold service down to the -20°C test temperature, such as spherical tanks and large storage vessels where the 490 MPa yield class allows thinner walls than conventional carbon-manganese plate. The minimum design temperature is set by the vessel code, the thickness and the impact test, not by the grade name.

The other grades of the 2011 book are GB/T 19189 07MnNiVDR Steel Plate, GB/T 19189 07MnNiMoDR Steel Plate, GB/T 19189 12MnNiVR Steel Plate. They differ in impact temperature, alloy route and welding purpose and are not interchangeable without design review.

Edition note. This page is the GB/T 19189-2011 product. New designs should use GB/T 713.6 Q490R Steel Plate under GB/T 713.6-2023. A certificate to one edition is not an automatic substitute for an order written to the other.

GB/T 19189-2011 is a pressure vessel plate standard. On its own it does not impose supplementary special-code requirements; where such a code applies, its supplementary requirements must be written on the order.

The comparison below places 07MnMoVR against its 2011 siblings, its 2023 successor and familiar foreign QT vessel plates. They are related by service, not interchangeable.

The designations below are related grades by product type and service, not certified equivalents. Strength, impact temperature, thickness limits, chemistry and delivery condition must be checked against the project specification before any substitution.

• SHH STEEL produces and exports GB/T 19189-2011 07MnMoVR plate as a producer, exporter and mill agent
• We quote to the edition written on your order and keep 2011 values separate from GB/T 713.6 Q490R values
• We check that the -20°C impact class and the 10–60 mm thickness limit match the design before quoting
• We review tempering, ultrasonic level, mid-thickness impact and simulated PWHT requirements before rolling, not after
• We match the inspection document to what the purchase order requires

Contact SHH STEEL for a quotation for GB/T 19189-2011 07MnMoVR quenched-and-tempered pressure vessel plate. Please include your required quantity, plate thickness, width and length, delivery destination and preferred delivery schedule so we can review your production and export requirements.

State the Charpy requirement if it differs from Table 2, any mid-thickness impact set, the ultrasonic standard and level, the PWHT or simulated PWHT cycle, and the inspection document required by the project.

If you are considering GB/T 713.6-2023 Q490R or another 2011 grade, send the design temperature and project specification with your enquiry. We will review the differences rather than assume the grades or editions are interchangeable.

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

Contact: admin@steelspecs.com